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


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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.CollectionFeature.SUPPORTS_RETAIN_ALL;
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.collect.testing.MinimalCollection;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;

/**
 * A generic JUnit test which tests {@code retainAll} operations on a list.
 * Can't be invoked directly; please see
 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * <p>This class is GWT compatible.
 *
 * @author Chris Povirk
 */
public class ListRetainAllTester<E> extends AbstractListTester<E> {
  @CollectionFeature.Require(SUPPORTS_RETAIN_ALL)
  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testRetainAll_duplicatesKept() {
    E[] array = createSamplesArray();
    array[1] = samples.e0;
    collection = getSubjectGenerator().create(array);
    assertFalse("containsDuplicates.retainAll(superset) should return false",
        collection.retainAll(MinimalCollection.of(createSamplesArray())));
    expectContents(array);
  }

  @SuppressWarnings("unchecked")
  @CollectionFeature.Require(SUPPORTS_RETAIN_ALL)
  @CollectionSize.Require(SEVERAL)
  public void testRetainAll_duplicatesRemoved() {
    E[] array = createSamplesArray();
    array[1] = samples.e0;
    collection = getSubjectGenerator().create(array);
    assertTrue("containsDuplicates.retainAll(subset) should return true",
        collection.retainAll(MinimalCollection.of(samples.e2)));
    expectContents(samples.e2);
  }
}