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/*
* Copyright (C) 2008 The Guava Authors
*
* 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.google.common.collect.testing.testers;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_QUERIES;
import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
import com.google.common.collect.testing.AbstractMapTester;
import com.google.common.collect.testing.WrongType;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
/**
* A generic JUnit test which tests {@code remove} operations on a map. Can't be
* invoked directly; please see
* {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
* @author Chris Povirk
*/
@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
public class MapRemoveTester<K, V> extends AbstractMapTester<K, V> {
@MapFeature.Require(SUPPORTS_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testRemove_present() {
int initialSize = getMap().size();
assertEquals("remove(present) should return the associated value",
samples.e0.getValue(), getMap().remove(samples.e0.getKey()));
assertEquals("remove(present) should decrease a map's size by one.",
initialSize - 1, getMap().size());
expectMissing(samples.e0);
}
@MapFeature.Require(SUPPORTS_REMOVE)
public void testRemove_notPresent() {
assertNull("remove(notPresent) should return null",
getMap().remove(samples.e3.getKey()));
expectUnchanged();
}
@MapFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_KEYS})
@CollectionSize.Require(absent = ZERO)
public void testRemove_nullPresent() {
initMapWithNullKey();
int initialSize = getMap().size();
assertEquals("remove(null) should return the associated value",
getValueForNullKey(), getMap().remove(null));
assertEquals("remove(present) should decrease a map's size by one.",
initialSize - 1, getMap().size());
expectMissing(entry(null, getValueForNullKey()));
}
@MapFeature.Require(absent = SUPPORTS_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testRemove_unsupported() {
try {
getMap().remove(samples.e0.getKey());
fail("remove(present) should throw UnsupportedOperationException");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
assertEquals("remove(present) should not remove the element",
samples.e0.getValue(), get(samples.e0.getKey()));
}
@MapFeature.Require(absent = SUPPORTS_REMOVE)
public void testRemove_unsupportedNotPresent() {
try {
assertNull("remove(notPresent) should return null or throw "
+ "UnsupportedOperationException",
getMap().remove(samples.e3.getKey()));
} catch (UnsupportedOperationException tolerated) {
}
expectUnchanged();
expectMissing(samples.e3);
}
@MapFeature.Require(
value = SUPPORTS_REMOVE,
absent = ALLOWS_NULL_QUERIES)
public void testRemove_nullQueriesNotSupported() {
try {
assertNull("remove(null) should return null or throw "
+ "NullPointerException",
getMap().remove(null));
} catch (NullPointerException tolerated) {
}
expectUnchanged();
}
@MapFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_QUERIES})
public void testRemove_nullSupportedMissing() {
assertNull("remove(null) should return null", getMap().remove(null));
expectUnchanged();
}
@MapFeature.Require(SUPPORTS_REMOVE)
public void testRemove_wrongType() {
try {
assertNull(getMap().remove(WrongType.VALUE));
} catch (ClassCastException tolerated) {
}
expectUnchanged();
}
}
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