path: root/tests/wifitests/src/com/android/server/wifi/WifiQualifiedNetworkSelectorTest.java

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

package com.android.server.wifi;

import static com.android.server.wifi.WifiConfigurationTestUtil.SECURITY_EAP;
import static com.android.server.wifi.WifiConfigurationTestUtil.SECURITY_NONE;
import static com.android.server.wifi.WifiConfigurationTestUtil.SECURITY_PSK;
import static com.android.server.wifi.WifiConfigurationTestUtil.generateWifiConfig;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyBoolean;
import static org.mockito.Matchers.anyInt;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.validateMockitoUsage;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import android.content.Context;
import android.content.res.Resources;
import android.net.NetworkScoreManager;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiEnterpriseConfig;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiSsid;
import android.os.SystemClock;
import android.test.suitebuilder.annotation.SmallTest;
import android.util.LocalLog;

import com.android.internal.R;
import com.android.server.wifi.MockAnswerUtil.AnswerWithArguments;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Unit tests for {@link com.android.server.wifi.WifiQualifiedNetworkSelector}.
 */
@SmallTest
public class WifiQualifiedNetworkSelectorTest {

    @Before
    public void setUp() throws Exception {
        mResource = getResource();
        mScoreManager = getNetworkScoreManager();
        mScoreCache = getScoreCache();
        mContext = getContext();
        mWifiConfigManager = getWifiConfigManager();
        mWifiInfo = getWifiInfo();
        mLocalLog = getLocalLog();

        mWifiQualifiedNetworkSelector = new WifiQualifiedNetworkSelector(mWifiConfigManager,
                mContext, mWifiInfo, mClock);
        mWifiQualifiedNetworkSelector.enableVerboseLogging(1);
        mWifiQualifiedNetworkSelector.setUserPreferredBand(1);
        mWifiQualifiedNetworkSelector.setWifiNetworkScoreCache(mScoreCache);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime());
    }

    @After
    public void cleanup() {
        validateMockitoUsage();
    }

    private WifiQualifiedNetworkSelector mWifiQualifiedNetworkSelector = null;
    private WifiConfigManager mWifiConfigManager = null;
    private Context mContext;
    private Resources mResource;
    private NetworkScoreManager mScoreManager;
    private WifiNetworkScoreCache mScoreCache;
    private WifiInfo mWifiInfo;
    private LocalLog mLocalLog;
    private Clock mClock = mock(Clock.class);
    private static final String[] DEFAULT_SSIDS = {"\"test1\"", "\"test2\""};
    private static final String[] DEFAULT_BSSIDS = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4"};
    private static final String TAG = "QNS Unit Test";

    private List<ScanDetail> getScanDetails(String[] ssids, String[] bssids, int[] frequencies,
                                            String[] caps, int[] levels) {
        List<ScanDetail> scanDetailList = new ArrayList<ScanDetail>();
        long timeStamp = mClock.elapsedRealtime();
        for (int index = 0; index < ssids.length; index++) {
            ScanDetail scanDetail = new ScanDetail(WifiSsid.createFromAsciiEncoded(ssids[index]),
                    bssids[index], caps[index], levels[index], frequencies[index], timeStamp, 0);
            scanDetailList.add(scanDetail);
        }
        return scanDetailList;
    }

    Context getContext() {
        Context context = mock(Context.class);
        Resources resource = mock(Resources.class);

        when(context.getResources()).thenReturn(mResource);
        when(context.getSystemService(Context.NETWORK_SCORE_SERVICE)).thenReturn(mScoreManager);
        return context;
    }

    Resources getResource() {
        Resources resource = mock(Resources.class);

        when(resource.getInteger(R.integer.config_wifi_framework_SECURITY_AWARD)).thenReturn(80);
        when(resource.getInteger(R.integer.config_wifi_framework_RSSI_SCORE_OFFSET)).thenReturn(85);
        when(resource.getInteger(R.integer.config_wifi_framework_SAME_BSSID_AWARD)).thenReturn(24);
        when(resource.getInteger(R.integer.config_wifi_framework_LAST_SELECTION_AWARD))
                .thenReturn(480);
        when(resource.getInteger(R.integer.config_wifi_framework_PASSPOINT_SECURITY_AWARD))
                .thenReturn(40);
        when(resource.getInteger(R.integer.config_wifi_framework_SECURITY_AWARD)).thenReturn(80);
        when(resource.getInteger(R.integer.config_wifi_framework_RSSI_SCORE_SLOPE)).thenReturn(4);
        return resource;
    }

    NetworkScoreManager getNetworkScoreManager() {
        NetworkScoreManager networkScoreManager = mock(NetworkScoreManager.class);

        return networkScoreManager;
    }

    WifiNetworkScoreCache getScoreCache() {
        return mock(WifiNetworkScoreCache.class);
    }

    LocalLog getLocalLog() {
        return new LocalLog(0);
    }

    WifiInfo getWifiInfo() {
        WifiInfo wifiInfo = mock(WifiInfo.class);

        //simulate a disconnected state
        when(wifiInfo.is24GHz()).thenReturn(true);
        when(wifiInfo.is5GHz()).thenReturn(false);
        when(wifiInfo.getRssi()).thenReturn(-70);
        when(wifiInfo.getNetworkId()).thenReturn(WifiConfiguration.INVALID_NETWORK_ID);
        when(wifiInfo.getBSSID()).thenReturn(null);
        when(wifiInfo.getNetworkId()).thenReturn(-1);
        return wifiInfo;
    }

    WifiConfigManager getWifiConfigManager() {
        WifiConfigManager wifiConfigManager = mock(WifiConfigManager.class);
        wifiConfigManager.mThresholdSaturatedRssi24 = new AtomicInteger(
                WifiQualifiedNetworkSelector.RSSI_SATURATION_2G_BAND);
        wifiConfigManager.mBandAward5Ghz = new AtomicInteger(
                WifiQualifiedNetworkSelector.BAND_AWARD_5GHz);
        wifiConfigManager.mCurrentNetworkBoost = new AtomicInteger(
                WifiQualifiedNetworkSelector.SAME_NETWORK_AWARD);
        wifiConfigManager.mThresholdQualifiedRssi5 = new AtomicInteger(
                WifiQualifiedNetworkSelector.QUALIFIED_RSSI_5G_BAND);
        wifiConfigManager.mThresholdMinimumRssi24 = new AtomicInteger(
                WifiQualifiedNetworkSelector.MINIMUM_2G_ACCEPT_RSSI);
        wifiConfigManager.mThresholdMinimumRssi5 = new AtomicInteger(
                WifiQualifiedNetworkSelector.MINIMUM_5G_ACCEPT_RSSI);

        when(wifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        return wifiConfigManager;
    }

    /**
     * This API is used to generate multiple simulated saved configurations used for test
     *
     * @param ssid     array of SSID of saved configuration
     * @param security array  of securities of  saved configuration
     * @return generated new array of configurations based on input
     */
    private WifiConfiguration[] generateWifiConfigurations(String[] ssid, int[] security) {
        if (ssid == null || security == null || ssid.length != security.length
                || ssid.length == 0) {
            return null;
        }

        WifiConfiguration[] configs = new WifiConfiguration[ssid.length];
        for (int index = 0; index < ssid.length; index++) {
            configs[index] = generateWifiConfig(index, 0, ssid[index], false, true, null, null,
                    security[index]);
        }

        return configs;
    }

    /**
     * set configuration to a passpoint configuration
     *
     * @param config The configuration need to be set as a passipoint configuration
     */
    private void setConfigPasspoint(WifiConfiguration config) {
        config.FQDN = "android.qns.unitTest";
        config.providerFriendlyName = "android.qns.unitTest";
        WifiEnterpriseConfig enterpriseConfig = mock(WifiEnterpriseConfig.class);
        when(enterpriseConfig.getEapMethod()).thenReturn(WifiEnterpriseConfig.Eap.PEAP);

    }

    /**
     * add the Configurations to WifiConfigManager (WifiConfigureStore can take them out according
     * to the networkd ID)
     *
     * @param configs input configuration need to be added to WifiConfigureStore
     */
    private void prepareConfigStore(final WifiConfiguration[] configs) {
        when(mWifiConfigManager.getWifiConfiguration(anyInt()))
                .then(new AnswerWithArguments() {
                    public WifiConfiguration answer(int netId) {
                        if (netId >= 0 && netId < configs.length) {
                            return configs[netId];
                        } else {
                            return null;
                        }
                    }
                });
    }

    /**
     * Link scan results to the saved configurations.
     *
     * The shorter of the 2 input params will be used to loop over so the inputs don't
     * need to be of equal length. If there are more scan details then configs the remaining scan
     * details will be associated with a NULL config.
     *
     * @param configs     saved configurations
     * @param scanDetails come in scan results
     */
    private void scanResultLinkConfiguration(WifiConfiguration[] configs,
                                             List<ScanDetail> scanDetails) {
        if (scanDetails.size() <= configs.length) {
            for (int i = 0; i < scanDetails.size(); i++) {
                ScanDetail scanDetail = scanDetails.get(i);
                List<WifiConfiguration> associateWithScanResult = new ArrayList<>();
                associateWithScanResult.add(configs[i]);
                when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetail),
                        anyBoolean())).thenReturn(associateWithScanResult);
            }
        } else {
            for (int i = 0; i < configs.length; i++) {
                ScanDetail scanDetail = scanDetails.get(i);
                List<WifiConfiguration> associateWithScanResult = new ArrayList<>();
                associateWithScanResult.add(configs[i]);
                when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetail),
                        anyBoolean())).thenReturn(associateWithScanResult);
            }

            // associated the remaining scan details with a NULL config.
            for (int i = configs.length; i < scanDetails.size(); i++) {
                when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetails.get(i)),
                        anyBoolean())).thenReturn(null);
            }
        }
    }

    private void configureScoreCache(List<ScanDetail> scanDetails, Integer[] scores,
            boolean[] meteredHints) {
        for (int i = 0; i < scanDetails.size(); i++) {
            ScanDetail scanDetail = scanDetails.get(i);
            Integer score = scores[i];
            ScanResult scanResult = scanDetail.getScanResult();
            if (score != null) {
                when(mScoreCache.isScoredNetwork(scanResult)).thenReturn(true);
                when(mScoreCache.hasScoreCurve(scanResult)).thenReturn(true);
                when(mScoreCache.getNetworkScore(eq(scanResult), anyBoolean())).thenReturn(score);
                when(mScoreCache.getNetworkScore(scanResult)).thenReturn(score);
            } else {
                when(mScoreCache.isScoredNetwork(scanResult)).thenReturn(false);
                when(mScoreCache.hasScoreCurve(scanResult)).thenReturn(false);
                when(mScoreCache.getNetworkScore(eq(scanResult), anyBoolean())).thenReturn(
                        WifiNetworkScoreCache.INVALID_NETWORK_SCORE);
                when(mScoreCache.getNetworkScore(scanResult)).thenReturn(
                        WifiNetworkScoreCache.INVALID_NETWORK_SCORE);
            }
            when(mScoreCache.getMeteredHint(scanResult)).thenReturn(meteredHints[i]);
        }
    }

    /**
     * verify whether the chosen configuration matched with the expected chosen scan result
     *
     * @param chosenScanResult the expected chosen scan result
     * @param candidate        the chosen configuration
     */
    private void verifySelectedResult(ScanResult chosenScanResult, WifiConfiguration candidate) {
        ScanResult candidateScan = candidate.getNetworkSelectionStatus().getCandidate();
        assertEquals("choose the wrong SSID", chosenScanResult.SSID, candidate.SSID);
        assertEquals("choose the wrong BSSID", chosenScanResult.BSSID, candidateScan.BSSID);
    }

    // QNS test under disconnected State

    /**
     * Case #1    choose 2GHz stronger RSSI test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled, encrypted and at 2.4 GHz
     * test1 is with RSSI -70 test2 is with RSSI -60
     *
     * Expected behavior: test2 is chosen
     */
    @Test
    public void chooseNetworkDisconnected2GHighestRssi() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2417};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-70, -60};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);

        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);

        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(scanDetails.size() - 1).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #2    choose 5GHz Stronger RSSI Test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled, encrypted and at 5 GHz
     * test1 is with RSSI -70 test2 is with RSSI -60
     *
     * Expected behavior: test2 is chosen
     */
    @Test
    public void chooseNetworkDisconnected5GHighestRssi() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5180, 5610};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-70, -60};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);

        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(scanDetails.size() - 1).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #3    5GHz over 2GHz bonus Test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -60
     * test2 is @ 5Ghz with RSSI -65
     *
     * Expected behavior: test2 is chosen due to 5GHz bonus
     */
    @Test
    public void chooseNetworkDisconnect5GOver2GTest() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-60, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(scanDetails.size() - 1).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #4    2GHz over 5GHz dur to 5GHz signal too weak test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -60
     * test2 is @ 5Ghz with RSSI -75
     *
     * Expected behavior: test1 is chosen due to 5GHz signal is too weak (5GHz bonus can not
     * compensate)
     */
    @Test
    public void chooseNetworkDisconnect2GOver5GTest() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-60, -75};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #5    2GHz signal Saturation test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -50
     * test2 is @ 5Ghz with RSSI -65
     *
     * Expected behavior: test2 is chosen. Although the RSSI delta here is 15 too, because 2GHz RSSI
     * saturates at -60, the real RSSI delta is only 5, which is less than 5GHz bonus
     */
    @Test
    public void chooseNetworkDisconnect2GRssiSaturationTest() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(scanDetails.size() - 1).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #6    Minimum RSSI test
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -86
     * test2 is @ 5Ghz with RSSI -83
     *
     * Expected behavior: no QNS is made because both network are below the minimum threshold, null
     */
    @Test
    public void chooseNetworkMinimumRssiTest() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {WifiQualifiedNetworkSelector.MINIMUM_2G_ACCEPT_RSSI - 1,
                WifiQualifiedNetworkSelector.MINIMUM_5G_ACCEPT_RSSI - 1};
        int[] security = {SECURITY_EAP, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        assertEquals("choose the wrong SSID", null, candidate);
    }

    /**
     * Case #7    encrypted network over passpoint network
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1 is secured network, test2 are passpoint network
     * Both network are enabled and at 2.4 GHz. Both have RSSI of -70
     *
     * Expected behavior: test1 is chosen since secured network has higher priority than passpoint
     * network
     */
    @Test
    public void chooseNetworkSecurityOverPassPoint() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] levels = {-70, -70};
        int[] security = {SECURITY_EAP, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        setConfigPasspoint(savedConfigs[1]);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #8    passpoint network over open network
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1 is passpoint network, test2 is open network
     * Both network are enabled and at 2.4 GHz. Both have RSSI of -70
     *
     * Expected behavior: test1 is chosen since passpoint network has higher priority than open
     * network
     */
    @Test
    public void chooseNetworkPasspointOverOpen() {
        String[] ssids = {"\"test1\"", "\"test2\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f8", "6c:f3:7f:ae:8c:f4"};
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-70, -70};
        int[] security = {SECURITY_NONE, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        setConfigPasspoint(savedConfigs[0]);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #9    secure network over open network
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * Two networks test1 is secure network, test2 is open network
     * Both network are enabled and at 2.4 GHz. Both have RSSI of -70
     *
     * Expected behavior: test1 is chosen since secured network has higher priority than open
     * network
     */
    @Test
    public void chooseNetworkSecureOverOpen() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-70, -70};
        int[] security = {SECURITY_PSK, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #10    first time user select a network
     *
     * In this test. we simulate following scenario
     * There are three saved networks: test1, test2 and test3. Now user select the network test3
     * check test3 has been saved in test1's and test2's ConnectChoice
     *
     * Expected behavior: test1's and test2's ConnectChoice should be test3, test3's ConnectChoice
     * should be null
     */
    @Test
    public void userSelectsNetworkForFirstTime() {
        String[] ssids = {"\"test1\"", "\"test2\"", "\"test3\""};
        int[] security = {SECURITY_PSK, SECURITY_PSK, SECURITY_NONE};

        final WifiConfiguration[] configs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(configs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(configs));
        for (WifiConfiguration network : configs) {
            WifiConfiguration.NetworkSelectionStatus status = network.getNetworkSelectionStatus();
            status.setSeenInLastQualifiedNetworkSelection(true);
        }

        mWifiQualifiedNetworkSelector.userSelectNetwork(configs.length - 1, true);
        String key = configs[configs.length - 1].configKey();
        for (int index = 0; index < configs.length; index++) {
            WifiConfiguration config = configs[index];
            WifiConfiguration.NetworkSelectionStatus status = config.getNetworkSelectionStatus();
            if (index == configs.length - 1) {
                assertEquals("User selected network should not have prefernce over it", null,
                        status.getConnectChoice());
            } else {
                assertEquals("Wrong user preference", key, status.getConnectChoice());
            }
        }
    }

    /**
     * Case #11    choose user selected network
     *
     * In this test, we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * There are three networks: test1, test2, test3 and test3 is the user preference
     * All three networks are enabled
     * test1 is @ 2.4GHz with RSSI -50 PSK
     * test2 is @ 5Ghz with RSSI -65 PSK
     * test3 is @ 2.4GHz with RSSI -55 open
     *
     * Expected behavior: test3 is chosen since it is user selected network. It overcome all other
     * priorities
     */
    @Test
    public void chooseUserPreferredNetwork() {
        String[] ssids = {"\"test1\"", "\"test2\"", "\"test3\""};
        int[] security = {SECURITY_PSK, SECURITY_PSK, SECURITY_NONE};

        final WifiConfiguration[] configs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(configs);
        for (WifiConfiguration network : configs) {
            WifiConfiguration.NetworkSelectionStatus status = network.getNetworkSelectionStatus();
            status.setSeenInLastQualifiedNetworkSelection(true);
        }

        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(configs));

        //set user preference
        mWifiQualifiedNetworkSelector.userSelectNetwork(ssids.length - 1, true);
        //Generate mocked recent scan results
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4", "6c:f3:7f:ae:8c:f5"};
        int[] frequencies = {2437, 5180, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]", "NONE"};
        int[] levels = {-50, -65, -55};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        scanResultLinkConfiguration(configs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(scanDetails.size() - 1).getScanResult();
        when(mWifiConfigManager.getWifiConfiguration(configs[2].configKey()))
                .thenReturn(configs[2]);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #12    enable a blacklisted BSSID
     *
     * In this test, we simulate following scenario:
     * For two Aps, BSSIDA and BSSIDB. Disable BSSIDA, then check whether BSSIDA is disabled and
     * BSSIDB is enabled. Then enable BSSIDA, check whether both BSSIDs are enabled.
     */
    @Test
    public void enableBssidTest() {
        String bssidA = "6c:f3:7f:ae:8c:f3";
        String bssidB = "6c:f3:7f:ae:8c:f4";
        //check by default these two BSSIDs should be enabled
        assertEquals("bssidA should be enabled by default",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidA), false);
        assertEquals("bssidB should be enabled by default",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidB), false);

        //disable bssidA 3 times, check whether A is dsiabled and B is still enabled
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssidA, false);
        assertEquals("bssidA should be disabled",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidA), false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssidA, false);
        assertEquals("bssidA should be disabled",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidA), false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssidA, false);
        assertEquals("bssidA should be disabled",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidA), true);
        assertEquals("bssidB should still be enabled",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidB), false);

        //re-enable bssidA, check whether A is dsiabled and B is still enabled
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssidA, true);
        assertEquals("bssidA should be enabled by default",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidA), false);
        assertEquals("bssidB should be enabled by default",
                mWifiQualifiedNetworkSelector.isBssidDisabled(bssidB), false);

        //make sure illegal input will not cause crash
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(null, false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(null, true);
    }

    /**
     * Case #13    do not choose the BSSID has been disabled
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network and found in scan results
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -65
     * test2 is @ 5Ghz with RSSI -50
     * test2's BSSID is disabled
     *
     * expected return test1 since test2's BSSID has been disabled
     */
    @Test
    public void networkChooseWithOneBssidDisabled() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-65, -50};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #14    re-choose the disabled BSSID after it is re-enabled
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network and found in scan results
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -65
     * test2 is @ 5Ghz with RSSI -50
     * test2's BSSID is disabled
     *
     * expected return test2 since test2's BSSID has been enabled again
     */
    @Test
    public void networkChooseWithOneBssidReenaabled() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-65, -50};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();

        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
        //re-enable it
        mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], true);
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #15    re-choose the disabled BSSID after its disability has expired
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network and found in scan results
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -65
     * test2 is @ 5Ghz with RSSI -50
     * test2's BSSID is disabled
     *
     * expected return test2 since test2's BSSID has been enabled again
     */
    @Test
    public void networkChooseWithOneBssidDisableExpire() {
        String[] ssids = {"\"test1\"", "\"test2\"", "\"test3\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4", "6c:f3:7f:ae:8c:f5"};
        int[] frequencies = {2437, 5180, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]",
                "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-65, -50, -60};
        int[] security = {SECURITY_PSK, SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();

        for (int index = 0; index < WifiQualifiedNetworkSelector.BSSID_BLACKLIST_THRESHOLD;
                index++) {
            mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[1], false);
            mWifiQualifiedNetworkSelector.enableBssidForQualityNetworkSelection(bssids[2], false);
        }

        //re-enable it
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime()
                + WifiQualifiedNetworkSelector.BSSID_BLACKLIST_EXPIRE_TIME);
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }
    /**
     * Case #16    do not choose the SSID has been disabled
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * Two networks test1, test2 are secured network and found in scan results
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -65
     * test2 is @ 5Ghz with RSSI -50
     * test2's SSID is disabled
     *
     * expected return test1 since test2's SSID has been disabled
     */
    @Test
    public void networkChooseWithOneSsidDisabled() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-65, -50};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        when(mWifiConfigManager.tryEnableQualifiedNetwork(anyInt())).thenReturn(true);
        savedConfigs[1].getNetworkSelectionStatus().setNetworkSelectionStatus(
                WifiConfiguration.NetworkSelectionStatus.NETWORK_SELECTION_TEMPORARY_DISABLED);
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #17    do not make QNS is link is bouncing now
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state and currently is under link bouncing
     * Two networks test1, test2 are secured network and found in scan results
     * Both network are enabled
     * test1 is @ 2GHz with RSSI -50
     * test2 is @ 5Ghz with RSSI -50
     *
     * expected return null
     */
    @Test
    public void noQNSWhenLinkBouncingDisconnected() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {WifiQualifiedNetworkSelector.MINIMUM_2G_ACCEPT_RSSI - 1,
                WifiQualifiedNetworkSelector.MINIMUM_5G_ACCEPT_RSSI - 1};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, true, false, true, false);

        assertEquals("choose the wrong network", null, candidate);
    }

    /**
     * Case #18    QNS with very short gap
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under disconnected state
     * If last QNS is made in less than MINIMUM_QUALIFIED_NETWORK_SELECTION_INTERVAL, we
     * still should make new QNS since it is disconnected now
     *
     * expect return test1 because of band bonus
     */
    @Test
    public void networkSelectionInShortGap() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        //first QNS
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        //immediately second QNS
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();

        verifySelectedResult(chosenScanResult, candidate);
    }

    //Unit test for Connected State

    /**
     * Case #19    no QNS with very short gap when connected
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and test2 is connected
     * When WifiStateMachine is already in connected state, if last QNS is made in less than
     * MINIMUM_QUALIFIED_NETWORK_SELECTION_INTERVAL, no new QNS should be made
     *
     * expect return NULL
     */
    @Test
    public void noNetworkSelectionDueToShortGap() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        //first QNS
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        //immediately second QNS
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();
        assertEquals("choose the wrong BSSID", null, candidate);
    }

    /**
     * Case #20    force QNS with very short gap under connection
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and test2 is connected
     * When WifiStateMachine is already in connected state, if last QNS is made in less than
     * MINIMUM_QUALIFIED_NETWORK_SELECTION_INTERVAL, no new QNS should be made. However, if we force
     * to make new QNS, QNS still will be made
     *
     * expect return test2 since it is the current connected one (bonus)
     */
    @Test
    public void forceNetworkSelectionInShortGap() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        //first QNS
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        //immediately second QNS
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(true,
                false, scanDetails, false, true, false, false);
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #21    no QNS when connected and user do not allow switch when connected
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and test2 is connected
     * if user does not allow switch network when connected, do not make new QNS when connected
     *
     * expect return NULL
     */
    @Test
    public void noNewNetworkSelectionDuetoUserDisableSwitchWhenConnected() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        assertEquals("choose the wrong BSSID", null, candidate);
        assertEquals("Should receive zero filteredScanDetails", 0,
                mWifiQualifiedNetworkSelector.getFilteredScanDetails().size());
    }

    /**
     * Case #22    no new QNS if current network is qualified already
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and test2 is connected
     * If current connected network is Qualified already, do not make new QNS
     * simulated current connected network as:
     * 5GHz, RSSI = WifiQualifiedNetworkSelector.QUALIFIED_RSSI_5G_BAND, secured
     *
     * expected return null
     */
    @Test
    public void noNewQNSCurrentNetworkQualified() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-65, WifiQualifiedNetworkSelector.QUALIFIED_RSSI_5G_BAND};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        //first time, connect to test2 due to 5GHz bonus
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);

        levels[0] = -50; // if there is QNS, test1 will be chosen
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        assertEquals("choose the wrong BSSID", null, candidate);
    }

    /**
     * Case #23    No new QNS when link bouncing when connected
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and test2 is connected
     * no new QNS when link is bouncing
     *
     * expected return null
     */
    @Test
    public void noNewQNSLinkBouncing() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 5180};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-70, -75};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        //first connect to test2 due to 5GHz bonus
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, true, true, false, false);
        assertEquals("choose the wrong BSSID", null, candidate);
    }

    /**
     * Case #24    Qualified network need to be on 5GHz
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and connected to test2
     * if current connected network is not 5GHz, then it is not qualified. We should make new QNS
     *
     * expected result: return test1
     */
    @Test
    public void currentNetworkNotQualifiedDueToBandMismatch() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-50, -65};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        when(mWifiInfo.getNetworkId()).thenReturn(0);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[0]);
        when(mWifiInfo.is24GHz()).thenReturn(true);
        //connect to config2 first
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);

        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #25    Qualified network need to be secured
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connects to test2
     * if current connected network is open network, then it is not qualified. We should make new
     * QNS
     *
     * expected result: return test1 since test1 has higher RSSI
     */
    @Test
    public void currentNetworkNotQualifiedDueToOpenNetwork() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5400, 5400};
        String[] caps = {"[ESS]", "[ESS]"};
        int[] levels = {-70, -65};
        int[] security = {SECURITY_NONE, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        //first connect to test2 because of RSSI
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);
        when(mWifiInfo.is5GHz()).thenReturn(true);
        when(mWifiConfigManager.isOpenNetwork(savedConfigs[1])).thenReturn(true);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -60;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #26    ephemeral network can not be qualified network
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * if current connected network is ephemeral network, then it is not qualified. We should make
     * new QNS
     *
     * expected result: return test1 (since test2 is ephemeral)
     */
    @Test
    public void currentNetworkNotQualifiedDueToEphemeral() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, -50};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        savedConfigs[1].ephemeral = true;
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        //first connect to test2 since test1's RSSI is negligible
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);

        levels[0] = -70;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #27    low signal network can not be Qualified network (5GHz)
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * if current connected network's rssi is too low, then it is not qualified. We should
     * make new QNS
     *
     * expected result: return test1
     */
    @Test
    public void currentNetworkNotQualifiedDueToLow5GRssi() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-80, WifiQualifiedNetworkSelector.QUALIFIED_RSSI_5G_BAND - 1};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.getRssi()).thenReturn(levels[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);
        when(mWifiInfo.is5GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        levels[0] = -60;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #28    low signal network can not be Qualified network (2.4GHz)
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * if current connected network's rssi is too low, then it is not qualified. We should
     * make new QNS
     *
     * expected result: return test1
     */
    @Test
    public void currentNetworkNotQualifiedDueToLow2GRssi() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, WifiQualifiedNetworkSelector.QUALIFIED_RSSI_24G_BAND - 1};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);
        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);

        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.getRssi()).thenReturn(levels[1]);
        when(mWifiInfo.is24GHz()).thenReturn(false);
        when(mWifiInfo.is5GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -60;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #29    Choose current network due to current network bonus
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * To connect to a network which is not linked to current connected network, unless this network
     * is more than 10 db higher than current network, we should not switch. So although test2 has a
     * lower signal, we still choose test2
     *
     * expected result: return test2
     */
    @Test
    public void currentNetworkStayDueToSameNetworkBonus() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, -80};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);
        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -80 + WifiQualifiedNetworkSelector.SAME_BSSID_AWARD / 4
                + WifiQualifiedNetworkSelector.SAME_NETWORK_AWARD / 4 - 1;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #30    choose another network due to current network's signal is too low
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * To connect to a network which is not linked to current connected network, if this network
     * is more than 10 db higher than current network, we should switch
     *
     * expected new result: return test1
     */
    @Test
    public void switchNetworkStayDueToCurrentNetworkRssiLow() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, -80};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);

        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -80 + WifiQualifiedNetworkSelector.SAME_BSSID_AWARD / 4
                + WifiQualifiedNetworkSelector.SAME_NETWORK_AWARD / 4 + 1;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #31    Choose current BSSID due to current BSSID bonus
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * Linked network will be treated as same network. To connect to a network which is linked to
     * current connected network, unless this network is more than 6 db higher than current network,
     * we should not switch AP and stick to current BSSID
     *
     * expected result: return test2
     */
    @Test
    public void currentBssidStayDueToSameBSSIDBonus() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, -80};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        //link two configuration
        savedConfigs[0].linkedConfigurations = new HashMap<String, Integer>();
        savedConfigs[1].linkedConfigurations = new HashMap<String, Integer>();
        savedConfigs[0].linkedConfigurations.put(savedConfigs[1].configKey(), 1);
        savedConfigs[1].linkedConfigurations.put(savedConfigs[0].configKey(), 1);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);

        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -80 + WifiQualifiedNetworkSelector.SAME_NETWORK_AWARD / 4 - 1;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #32    Choose another BSSID due to current BSSID's rssi is too low
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is under connected state and current connected to test2
     * Linked network will be treated as same network. To connect to a network which is linked to
     * current connected network, unless this network is more than 6 db higher than current network,
     * we should not switch AP and stick to current BSSID
     *
     * expected result: return test2
     */
    @Test
    public void swithBssidDueToLowRssi() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {2437, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS][ESS]"};
        int[] levels = {-100, -80};
        int[] security = {SECURITY_PSK, SECURITY_PSK};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        //link two configuration
        savedConfigs[0].linkedConfigurations = new HashMap<String, Integer>();
        savedConfigs[1].linkedConfigurations = new HashMap<String, Integer>();
        savedConfigs[0].linkedConfigurations.put(savedConfigs[1].configKey(), 1);
        savedConfigs[1].linkedConfigurations.put(savedConfigs[0].configKey(), 1);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false, false, scanDetails, false,
                false, true, false);

        when(mWifiInfo.getNetworkId()).thenReturn(1);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiInfo.is24GHz()).thenReturn(true);

        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);
        levels[0] = -80 + WifiQualifiedNetworkSelector.SAME_BSSID_AWARD / 4 + 1;
        scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        when(mClock.elapsedRealtime()).thenReturn(SystemClock.elapsedRealtime() + 11 * 1000);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #33  Choose an ephemeral network with a good score because no saved networks
     *           are available.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is an enterprise network w/o a score.
     * test2 is an open network with a good score. Additionally it's a metered network.
     * isUntrustedConnectionsAllowed is set to true.
     *
     * expected result: return test2 with meteredHint set to True.
     */
    @Test
    public void selectQualifiedNetworkChoosesEphemeral() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] levels = {-70, -70};
        Integer[] scores = {null, 120};
        boolean[] meteredHints = {false, true};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        // No saved networks.
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(any(ScanDetail.class),
                anyBoolean())).thenReturn(null);

        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        // Setup the config as an invalid candidate. This is done to workaround a Mockito issue.
        // Basically Mockito is unable to mock package-private methods in classes loaded from a
        // different Jar (like all of the framework code) which results in the actual saveNetwork()
        // method being invoked in this case. Because the config is invalid it quickly returns.
        unTrustedNetworkCandidate.SSID = null;
        unTrustedNetworkCandidate.networkId = WifiConfiguration.INVALID_NETWORK_ID;
        ScanResult untrustedScanResult = scanDetails.get(1).getScanResult();
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(untrustedScanResult))
                .thenReturn(unTrustedNetworkCandidate);

        WifiConfiguration.NetworkSelectionStatus selectionStatus =
                mock(WifiConfiguration.NetworkSelectionStatus.class);
        when(unTrustedNetworkCandidate.getNetworkSelectionStatus()).thenReturn(selectionStatus);
        when(selectionStatus.getCandidate()).thenReturn(untrustedScanResult);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                true /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verify(selectionStatus).setCandidate(untrustedScanResult);
        assertSame(unTrustedNetworkCandidate, candidate);
        assertEquals(meteredHints[1], candidate.meteredHint);
    }

    /**
     * Case #34    Test Filtering of potential candidate scanDetails (Untrusted allowed)
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * test1 is @ 2GHz with RSSI -60
     * test2 is @ 5Ghz with RSSI -86, (below minimum threshold)
     * test3 is @ 5Ghz with RSSI -50, however it has no associated saved config
     * test4 is @ 2Ghz with RSSI -62, no associated config, but is Ephemeral
     *
     * Expected behavior: test1 is chosen due to 5GHz signal is too weak (5GHz bonus can not
     * compensate).
     * test1 & test4's scanDetails are returned by 'getFilteredScanDetail()'
     */
    @Test
    public void testGetFilteredScanDetailsReturnsOnlyConsideredScanDetails_untrustedAllowed() {
        String[] ssids = {"\"test1\"", "\"test2\"", "\"test3\"", "\"test4\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4", "de:ad:ba:b1:e5:55",
                "c0:ff:ee:ee:e3:ee"};
        int[] frequencies = {2437, 5180, 5180, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS]",
                "[WPA2-EAP-CCMP][ESS]"};
        int[] levels = {-60, -86, -50, -62};
        int[] security = {SECURITY_PSK, SECURITY_PSK, SECURITY_PSK, SECURITY_PSK};
        boolean[] meteredHints = {false, false, false, true};
        Integer[] scores = {null, null, null, 120};

        //Create all 4 scanDetails
        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);

        //Setup NetworkScoreCache for detecting ephemeral networks ("test4")
        configureScoreCache(scanDetails, scores, meteredHints);
        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        unTrustedNetworkCandidate.SSID = null;
        unTrustedNetworkCandidate.networkId = WifiConfiguration.INVALID_NETWORK_ID;
        ScanResult untrustedScanResult = scanDetails.get(3).getScanResult();
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(untrustedScanResult))
                .thenReturn(unTrustedNetworkCandidate);
        WifiConfiguration.NetworkSelectionStatus selectionStatus =
                        mock(WifiConfiguration.NetworkSelectionStatus.class);
        when(unTrustedNetworkCandidate.getNetworkSelectionStatus()).thenReturn(selectionStatus);

        //Set up associated configs for test1 & test2
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(
                Arrays.copyOfRange(ssids, 0, 2), Arrays.copyOfRange(security, 0, 2));
        prepareConfigStore(savedConfigs);
        List<ScanDetail> savedScanDetails = new ArrayList<ScanDetail>(scanDetails.subList(0, 2));
        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, savedScanDetails);

        //Force mock ConfigManager to return null (and not an empty list) for "test3" & "test4"
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetails.get(2)),
                anyBoolean())).thenReturn(null);
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetails.get(3)),
                anyBoolean())).thenReturn(null);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                true /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);

        verifySelectedResult(chosenScanResult, candidate);
        //Verify two scanDetails returned in the filteredScanDetails
        assertEquals(2, mWifiQualifiedNetworkSelector.getFilteredScanDetails().size());
        assertEquals(mWifiQualifiedNetworkSelector.getFilteredScanDetails().get(0).first.toString(),
                scanDetails.get(0).toString());
        assertEquals(mWifiQualifiedNetworkSelector.getFilteredScanDetails().get(1).first.toString(),
                scanDetails.get(3).toString());
    }


    /**
     * Case #35    Test Filtering of potential candidate scanDetails (Untrusted disallowed)
     *
     * In this test. we simulate following scenario
     * WifiStateMachine is under disconnected state
     * test1 is @ 2GHz with RSSI -60
     * test2 is @ 5Ghz with RSSI -86, (below minimum threshold)
     * test3 is @ 5Ghz with RSSI -50, however it has no associated saved config
     * test4 is @ 2Ghz with RSSI -62, no associated config, but is Ephemeral
     *
     * Expected behavior: test1 is chosen due to 5GHz signal is too weak (5GHz bonus can not
     * compensate).
     * test1 & test4's scanDetails are returned by 'getFilteredScanDetail()'
     */
    @Test
    public void testGetFilteredScanDetailsReturnsOnlyConsideredScanDetails_untrustedDisallowed() {
        String[] ssids = {"\"test1\"", "\"test2\"", "\"test3\"", "\"test4\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4", "de:ad:ba:b1:e5:55",
                "c0:ff:ee:ee:e3:ee"};
        int[] frequencies = {2437, 5180, 5180, 2437};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS]", "[WPA2-EAP-CCMP][ESS]",
                "[WPA2-EAP-CCMP][ESS]"};
        int[] levels = {-60, -86, -50, -62};
        int[] security = {SECURITY_PSK, SECURITY_PSK, SECURITY_PSK, SECURITY_PSK};
        boolean[] meteredHints = {false, false, false, true};
        Integer[] scores = {null, null, null, 120};

        //Create all 4 scanDetails
        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);

        //Setup NetworkScoreCache for detecting ephemeral networks ("test4")
        configureScoreCache(scanDetails, scores, meteredHints);
        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        unTrustedNetworkCandidate.SSID = null;
        unTrustedNetworkCandidate.networkId = WifiConfiguration.INVALID_NETWORK_ID;
        ScanResult untrustedScanResult = scanDetails.get(3).getScanResult();
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(untrustedScanResult))
                .thenReturn(unTrustedNetworkCandidate);
        WifiConfiguration.NetworkSelectionStatus selectionStatus =
                        mock(WifiConfiguration.NetworkSelectionStatus.class);
        when(unTrustedNetworkCandidate.getNetworkSelectionStatus()).thenReturn(selectionStatus);

        //Set up associated configs for test1 & test2
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(
                Arrays.copyOfRange(ssids, 0, 2), Arrays.copyOfRange(security, 0, 2));
        prepareConfigStore(savedConfigs);
        List<ScanDetail> savedScanDetails = new ArrayList<ScanDetail>(scanDetails.subList(0, 2));
        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, savedScanDetails);

        //Force mock ConfigManager to return null (and not an empty list) for "test3" & "test4"
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetails.get(2)),
                anyBoolean())).thenReturn(null);
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(eq(scanDetails.get(3)),
                anyBoolean())).thenReturn(null);

        ScanResult chosenScanResult = scanDetails.get(0).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                false /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);

        verifySelectedResult(chosenScanResult, candidate);
        //Verify two scanDetails returned in the filteredScanDetails
        assertEquals(1, mWifiQualifiedNetworkSelector.getFilteredScanDetails().size());
        assertEquals(mWifiQualifiedNetworkSelector.getFilteredScanDetails().get(0).first.toString(),
                scanDetails.get(0).toString());
    }

    /**
     * Case #36  Ignore an ephemeral network if it was previously deleted.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is an open network with a low score. Additionally it's a metered network.
     * test2 is an open network with a good score but was previously deleted.
     * isUntrustedConnectionsAllowed is set to true.
     *
     * expected result: return test1 with meteredHint set to True.
     */
    @Test
    public void selectQualifiedNetworkDoesNotChooseDeletedEphemeral() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] levels = {-70, -70};
        Integer[] scores = {20, 120};
        boolean[] meteredHints = {true, false};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        // No saved networks.
        when(mWifiConfigManager.updateSavedNetworkWithNewScanDetail(any(ScanDetail.class),
                anyBoolean())).thenReturn(null);

        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        // Setup the config as an invalid candidate. This is done to workaround a Mockito issue.
        // Basically Mockito is unable to mock package-private methods in classes loaded from a
        // different Jar (like all of the framework code) which results in the actual saveNetwork()
        // method being invoked in this case. Because the config is invalid it quickly returns.
        unTrustedNetworkCandidate.SSID = null;
        unTrustedNetworkCandidate.networkId = WifiConfiguration.INVALID_NETWORK_ID;
        ScanResult untrustedScanResult = scanDetails.get(0).getScanResult();
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(untrustedScanResult))
                .thenReturn(unTrustedNetworkCandidate);

        // The second scan result is for an ephemeral network which was previously deleted
        when(mWifiConfigManager
                .wasEphemeralNetworkDeleted(scanDetails.get(0).getScanResult().SSID))
                .thenReturn(false);
        when(mWifiConfigManager
                .wasEphemeralNetworkDeleted(scanDetails.get(1).getScanResult().SSID))
                .thenReturn(true);

        WifiConfiguration.NetworkSelectionStatus selectionStatus =
                mock(WifiConfiguration.NetworkSelectionStatus.class);
        when(unTrustedNetworkCandidate.getNetworkSelectionStatus()).thenReturn(selectionStatus);
        when(selectionStatus.getCandidate()).thenReturn(untrustedScanResult);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                true /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verify(selectionStatus).setCandidate(untrustedScanResult);
        assertSame(candidate, unTrustedNetworkCandidate);
        assertEquals(meteredHints[0], candidate.meteredHint);
    }

    /**
     * Case #37  Choose the saved config that doesn't qualify for external scoring.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is a saved network.
     * test2 is a saved network with useExternalScores set to true and a very high score.
     *
     * expected result: return test1 because saved networks that don't request external scoring
     *                  have a higher priority.
     */
    @Test
    public void selectQualifiedNetworkPrefersSavedWithoutExternalScores() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] security = {SECURITY_PSK, SECURITY_PSK};
        int[] levels = {-70, -70};
        Integer[] scores = {null, 120};
        boolean[] meteredHints = {false, true};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        WifiConfiguration[] savedConfigs = generateWifiConfigurations(DEFAULT_SSIDS, security);
        savedConfigs[1].useExternalScores = true; // test2 is set to use external scores.
        prepareConfigStore(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(savedConfigs));
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                false /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verifySelectedResult(scanDetails.get(0).getScanResult(), candidate);
        assertSame(candidate, savedConfigs[0]);
    }

    /**
     * Case #38  Choose the saved config that does qualify for external scoring when other saved
     *           networks are not available.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is a saved network with useExternalScores set to true and a very high score.
     * test2 is a saved network but not in range (not included in the scan results).
     *
     * expected result: return test1 because there are no better saved networks within range.
     */
    @Test
    public void selectQualifiedNetworkSelectsSavedWithExternalScores() {
        String[] ssids = {"\"test1\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3"};
        int[] frequencies = {5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]"};
        int[] security = {SECURITY_PSK, SECURITY_PSK};
        int[] levels = {-70};
        Integer[] scores = {120};
        boolean[] meteredHints = {false};

        // Scan details only contains 1 ssid, test1.
        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        // The saved config contains 2 ssids, test1 & test2.
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(DEFAULT_SSIDS, security);
        savedConfigs[0].useExternalScores = true; // test1 is set to use external scores.
        prepareConfigStore(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(savedConfigs));
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                false /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verifySelectedResult(scanDetails.get(0).getScanResult(), candidate);
        assertSame(candidate, savedConfigs[0]);
    }

    /**
     * Case #39  Choose the saved config that does qualify for external scoring over the
     *           untrusted network with the same score.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is a saved network with useExternalScores set to true and the same score as test1.
     * test2 is NOT saved network but in range with a good external score.
     *
     * expected result: return test1 because the tie goes to the saved network.
     */
    @Test
    public void selectQualifiedNetworkPrefersSavedWithExternalScoresOverUntrusted() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] security = {SECURITY_PSK, SECURITY_PSK};
        int[] levels = {-70, -70};
        Integer[] scores = {120, 120};
        boolean[] meteredHints = {false, true};

        // Both networks are in the scan results.
        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        // Set up the associated configs only for test1
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(
                Arrays.copyOfRange(ssids, 0, 1), Arrays.copyOfRange(security, 0, 1));
        savedConfigs[0].useExternalScores = true; // test1 is set to use external scores.
        prepareConfigStore(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(savedConfigs));
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(scanDetails.get(1).getScanResult()))
                .thenReturn(unTrustedNetworkCandidate);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                true /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verifySelectedResult(scanDetails.get(0).getScanResult(), candidate);
        assertSame(candidate, savedConfigs[0]);
    }

    /**
     * Case #40  Choose the ephemeral config over the saved config that does qualify for external
     *           scoring because the untrusted network has a higher score.
     *
     * In this test. we simulate following scenario:
     * WifiStateMachine is not connected to any network.
     * selectQualifiedNetwork() is called with 2 scan results, test1 and test2.
     * test1 is a saved network with useExternalScores set to true and a low score.
     * test2 is NOT saved network but in range with a good external score.
     *
     * expected result: return test2 because it has a better score.
     */
    @Test
    public void selectQualifiedNetworkPrefersUntrustedOverScoredSaved() {
        String[] ssids = DEFAULT_SSIDS;
        String[] bssids = DEFAULT_BSSIDS;
        int[] frequencies = {5200, 5200};
        String[] caps = {"[WPA2-EAP-CCMP][ESS]", "[ESS]"};
        int[] security = {SECURITY_PSK, SECURITY_PSK};
        int[] levels = {-70, -70};
        Integer[] scores = {10, 120};
        boolean[] meteredHints = {false, true};

        // Both networks are in the scan results.
        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        configureScoreCache(scanDetails, scores, meteredHints);

        // Set up the associated configs only for test1
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(
                Arrays.copyOfRange(ssids, 0, 1), Arrays.copyOfRange(security, 0, 1));
        savedConfigs[0].useExternalScores = true; // test1 is set to use external scores.
        prepareConfigStore(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(Arrays.asList(savedConfigs));
        scanResultLinkConfiguration(savedConfigs, scanDetails);
        WifiConfiguration unTrustedNetworkCandidate = mock(WifiConfiguration.class);
        unTrustedNetworkCandidate.SSID = null;
        unTrustedNetworkCandidate.networkId = WifiConfiguration.INVALID_NETWORK_ID;
        ScanResult untrustedScanResult = scanDetails.get(1).getScanResult();
        when(mWifiConfigManager
                .wifiConfigurationFromScanResult(untrustedScanResult))
                .thenReturn(unTrustedNetworkCandidate);
        WifiConfiguration.NetworkSelectionStatus selectionStatus =
                mock(WifiConfiguration.NetworkSelectionStatus.class);
        when(unTrustedNetworkCandidate.getNetworkSelectionStatus()).thenReturn(selectionStatus);
        when(selectionStatus.getCandidate()).thenReturn(untrustedScanResult);

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(
                false /* forceSelectNetwork */,
                true /* isUntrustedConnectionsAllowed */,
                scanDetails,
                false, /* isLinkDebouncing */
                false, /* isConnected */
                true, /* isDisconnected */
                false /* isSupplicantTransient */);
        verify(selectionStatus).setCandidate(untrustedScanResult);
        assertSame(unTrustedNetworkCandidate, candidate);
    }

    /**
     * Case #41 Ensure the ExternalScoreEvaluator correctly selects the untrusted network.
     *
     * In this test. we simulate following scenario:
     * The ExternalScoreEvaluator is asked to evaluate 1 untrusted network and 1 saved network.
     * The untrusted network has the higher score.
     *
     * expected result: The untrusted network is determined to be the best network.
     */
    @Test
    public void externalScoreEvaluator_untrustedIsBest() {
        WifiQualifiedNetworkSelector.ExternalScoreEvaluator evaluator =
                new WifiQualifiedNetworkSelector.ExternalScoreEvaluator(mLocalLog, true);
        ScanResult untrustedScanResult = new ScanResult();
        int untrustedScore = 100;
        evaluator.evalUntrustedCandidate(untrustedScore, untrustedScanResult);

        ScanResult savedScanResult = new ScanResult();
        int savedScore = 50;
        WifiConfiguration savedConfig = new WifiConfiguration();
        evaluator.evalSavedCandidate(savedScore, savedConfig, savedScanResult);
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.UNTRUSTED_NETWORK, evaluator.getBestCandidateType());
        assertEquals(untrustedScore, evaluator.getHighScore());
        assertSame(untrustedScanResult, evaluator.getScanResultCandidate());
    }

    /**
     * Case #42 Ensure the ExternalScoreEvaluator correctly selects the saved network.
     *
     * In this test. we simulate following scenario:
     * The ExternalScoreEvaluator is asked to evaluate 1 untrusted network and 1 saved network.
     * The saved network has the higher score.
     *
     * expected result: The saved network is determined to be the best network.
     */
    @Test
    public void externalScoreEvaluator_savedIsBest() {
        WifiQualifiedNetworkSelector.ExternalScoreEvaluator evaluator =
                new WifiQualifiedNetworkSelector.ExternalScoreEvaluator(mLocalLog, true);
        ScanResult untrustedScanResult = new ScanResult();
        int untrustedScore = 50;
        evaluator.evalUntrustedCandidate(untrustedScore, untrustedScanResult);

        ScanResult savedScanResult = new ScanResult();
        int savedScore = 100;
        WifiConfiguration savedConfig = new WifiConfiguration();
        evaluator.evalSavedCandidate(savedScore, savedConfig, savedScanResult);
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.SAVED_NETWORK, evaluator.getBestCandidateType());
        assertEquals(savedScore, evaluator.getHighScore());
        assertSame(savedScanResult, evaluator.getScanResultCandidate());
    }

    /**
     * Case #43 Ensure the ExternalScoreEvaluator correctly selects the saved network if a
     *          tie occurs.
     *
     * In this test. we simulate following scenario:
     * The ExternalScoreEvaluator is asked to evaluate 1 untrusted network and 1 saved network.
     * Both networks have the same score.
     *
     * expected result: The saved network is determined to be the best network.
     */
    @Test
    public void externalScoreEvaluator_tieScores() {
        WifiQualifiedNetworkSelector.ExternalScoreEvaluator evaluator =
                new WifiQualifiedNetworkSelector.ExternalScoreEvaluator(mLocalLog, true);
        ScanResult untrustedScanResult = new ScanResult();
        int untrustedScore = 100;
        evaluator.evalUntrustedCandidate(untrustedScore, untrustedScanResult);

        ScanResult savedScanResult = new ScanResult();
        int savedScore = 100;
        WifiConfiguration savedConfig = new WifiConfiguration();
        evaluator.evalSavedCandidate(savedScore, savedConfig, savedScanResult);
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.SAVED_NETWORK, evaluator.getBestCandidateType());
        assertEquals(savedScore, evaluator.getHighScore());
        assertSame(savedScanResult, evaluator.getScanResultCandidate());
    }

    /**
     * Case #44 Ensure the ExternalScoreEvaluator correctly selects the saved network out of
     *          multiple options.
     *
     * In this test. we simulate following scenario:
     * The ExternalScoreEvaluator is asked to evaluate 2 untrusted networks and 2 saved networks.
     * The high scores are equal and the low scores differ.
     *
     * expected result: The saved network is determined to be the best network.
     */
    @Test
    public void externalScoreEvaluator_multipleScores() {
        WifiQualifiedNetworkSelector.ExternalScoreEvaluator evaluator =
                new WifiQualifiedNetworkSelector.ExternalScoreEvaluator(mLocalLog, true);
        ScanResult untrustedScanResult = new ScanResult();
        int untrustedScore = 100;
        evaluator.evalUntrustedCandidate(untrustedScore, untrustedScanResult);
        evaluator.evalUntrustedCandidate(80, new ScanResult());

        ScanResult savedScanResult = new ScanResult();
        int savedScore = 100;
        WifiConfiguration savedConfig = new WifiConfiguration();
        evaluator.evalSavedCandidate(savedScore, savedConfig, savedScanResult);
        evaluator.evalSavedCandidate(90, new WifiConfiguration(), new ScanResult());
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.SAVED_NETWORK, evaluator.getBestCandidateType());
        assertEquals(savedScore, evaluator.getHighScore());
        assertSame(savedScanResult, evaluator.getScanResultCandidate());
    }

    /**
     * Case #45 Ensure the ExternalScoreEvaluator correctly handles NULL score inputs.
     *
     * In this test we simulate following scenario:
     * The ExternalScoreEvaluator is asked to evaluate both types of candidates with NULL scores.
     *
     * expected result: No crashes. The best candidate type is returned as NONE.
     */
    @Test
    public void externalScoreEvaluator_nullScores() {
        WifiQualifiedNetworkSelector.ExternalScoreEvaluator evaluator =
                new WifiQualifiedNetworkSelector.ExternalScoreEvaluator(mLocalLog, true);
        evaluator.evalUntrustedCandidate(null, new ScanResult());
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.NONE, evaluator.getBestCandidateType());
        evaluator.evalSavedCandidate(null, new WifiConfiguration(), new ScanResult());
        assertEquals(WifiQualifiedNetworkSelector.ExternalScoreEvaluator
                .BestCandidateType.NONE, evaluator.getBestCandidateType());
    }

    /**
     * Case #46   Choose 2.4GHz BSSID with stronger RSSI value over
     *            5GHz BSSID with weaker RSSI value
     *
     * In this test. we simulate following scenario:
     * Two APs are found in scan results
     * BSSID1 is @ 5GHz with RSSI -82
     * BSSID2 is @ 2Ghz with RSSI -72
     * These two BSSIDs get exactly the same QNS score
     *
     * expect BSSID2 to be chosen as it has stronger RSSI value
     */
    @Test
    public void chooseStrongerRssiOver5GHz() {
        String[] ssids = {"\"test1\"", "\"test1\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4"};
        int[] frequencies = {5220, 2437};
        String[] caps = {"[ESS]", "[ESS]"};
        int[] levels = {-82, -72};
        int[] security = {SECURITY_NONE, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();

        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);

        verifySelectedResult(chosenScanResult, candidate);
    }

    /**
     * Case #47   Choose the currently connected BSSID after a firmware initiated roaming.
     *
     * In this test. we simulate following scenario:
     * Two APs are found in scan results
     * BSSID1 is @ 2.4GHz with RSSI -78
     * BSSID2 is @ 2.4Ghz with RSSI -77
     * BSSID2 is chosen because of stronger RSSI. Then firmware initiates
     * a roaming to BSSID1. QNS now selects BSSID1 because of the bonus for currently
     * connected network even if BSSID 2 has slightly stronger signal strengh.
     *
     * expect BSSID2 to be chosen after firmware roaming
     */
    @Test
    public void chooseCurrentlyConnectedBssid() {
        String[] ssids = {"\"test1\"", "\"test1\""};
        String[] bssids = {"6c:f3:7f:ae:8c:f3", "6c:f3:7f:ae:8c:f4"};
        int[] frequencies = {2437, 2437};
        String[] caps = {"[ESS]", "[ESS]"};
        int[] levels = {-78, -77};
        int[] security = {SECURITY_NONE, SECURITY_NONE};

        List<ScanDetail> scanDetails = getScanDetails(ssids, bssids, frequencies, caps, levels);
        WifiConfiguration[] savedConfigs = generateWifiConfigurations(ssids, security);
        prepareConfigStore(savedConfigs);

        final List<WifiConfiguration> savedNetwork = Arrays.asList(savedConfigs);
        when(mWifiConfigManager.getSavedNetworks()).thenReturn(savedNetwork);
        scanResultLinkConfiguration(savedConfigs, scanDetails);

        // Choose BSSID2 as it has stronger RSSI
        ScanResult chosenScanResult = scanDetails.get(1).getScanResult();
        WifiConfiguration candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(false,
                false, scanDetails, false, false, true, false);
        verifySelectedResult(chosenScanResult, candidate);
        when(mWifiInfo.getBSSID()).thenReturn(bssids[1]);
        when(mWifiConfigManager.getEnableAutoJoinWhenAssociated()).thenReturn(true);

        // Choose BSSID2 as it has stronger RSSI and it is the currently connected BSSID
        chosenScanResult = scanDetails.get(1).getScanResult();
        candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(true,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);

        // Pretend firmware roamed the device to BSSID1
        when(mWifiInfo.getBSSID()).thenReturn(bssids[0]);

        // Choose BSSID1 as it is the currently connected BSSID even if BSSID2 has slightly
        // higher RSSI value.
        chosenScanResult = scanDetails.get(0).getScanResult();
        candidate = mWifiQualifiedNetworkSelector.selectQualifiedNetwork(true,
                false, scanDetails, false, true, false, false);
        verifySelectedResult(chosenScanResult, candidate);
    }
}