guava-testlib/src/com/google/common/collect/testing/testers/SortedSetNavigationTester.java


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/*
 * Copyright (C) 2010 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.ONE;
import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.features.CollectionSize;

import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.SortedSet;

/**
 * A generic JUnit test which tests operations on a SortedSet. Can't be
 * invoked directly; please see {@code SortedSetTestSuiteBuilder}.
 *
 * @author Jesse Wilson
 * @author Louis Wasserman
 */
@GwtCompatible
public class SortedSetNavigationTester<E> extends AbstractSetTester<E> {

  private SortedSet<E> sortedSet;
  private List<E> values;
  private E a;
  private E b;
  private E c;

  @Override public void setUp() throws Exception {
    super.setUp();
    sortedSet = (SortedSet<E>) getSet();
    values = Helpers.copyToList(getSubjectGenerator().getSampleElements(
        getSubjectGenerator().getCollectionSize().getNumElements()));
    Collections.sort(values, sortedSet.comparator());

    // some tests assume SEVERAL == 3
    if (values.size() >= 1) {
      a = values.get(0);
      if (values.size() >= 3) {
        b = values.get(1);
        c = values.get(2);
      }
    }
  }

  @CollectionSize.Require(ZERO)
  public void testEmptySetFirst() {
    try {
      sortedSet.first();
      fail();
    } catch (NoSuchElementException e) {
    }
  }

  @CollectionSize.Require(ZERO)
  public void testEmptySetLast() {
    try {
      sortedSet.last();
      fail();
    } catch (NoSuchElementException e) {
    }
  }

  @CollectionSize.Require(ONE)
  public void testSingletonSetFirst() {
    assertEquals(a, sortedSet.first());
  }

  @CollectionSize.Require(ONE)
  public void testSingletonSetLast() {
    assertEquals(a, sortedSet.last());
  }

  @CollectionSize.Require(SEVERAL)
  public void testFirst() {
    assertEquals(a, sortedSet.first());
  }

  @CollectionSize.Require(SEVERAL)
  public void testLast() {
    assertEquals(c, sortedSet.last());
  }
}