001/*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
020import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
021import static com.google.common.collect.testing.features.CollectionSize.ZERO;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.AbstractCollectionTester;
025import com.google.common.collect.testing.WrongType;
026import com.google.common.collect.testing.features.CollectionFeature;
027import com.google.common.collect.testing.features.CollectionSize;
028
029/**
030 * A generic JUnit test which tests {@code contains()} operations on a collection. Can't be invoked
031 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
032 *
033 * @author Kevin Bourrillion
034 * @author Chris Povirk
035 */
036@GwtCompatible
037public class CollectionContainsTester<E> extends AbstractCollectionTester<E> {
038  @CollectionSize.Require(absent = ZERO)
039  public void testContains_yes() {
040    assertTrue("contains(present) should return true", collection.contains(e0()));
041  }
042
043  public void testContains_no() {
044    assertFalse("contains(notPresent) should return false", collection.contains(e3()));
045  }
046
047  @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
048  public void testContains_nullNotContainedButQueriesSupported() {
049    assertFalse("contains(null) should return false", collection.contains(null));
050  }
051
052  @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
053  public void testContains_nullNotContainedAndUnsupported() {
054    expectNullMissingWhenNullUnsupported("contains(null) should return false or throw");
055  }
056
057  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
058  @CollectionSize.Require(absent = ZERO)
059  public void testContains_nonNullWhenNullContained() {
060    initCollectionWithNullElement();
061    assertFalse("contains(notPresent) should return false", collection.contains(e3()));
062  }
063
064  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
065  @CollectionSize.Require(absent = ZERO)
066  public void testContains_nullContained() {
067    initCollectionWithNullElement();
068    assertTrue("contains(null) should return true", collection.contains(null));
069  }
070
071  public void testContains_wrongType() {
072    try {
073      assertFalse(
074          "contains(wrongType) should return false or throw", collection.contains(WrongType.VALUE));
075    } catch (ClassCastException tolerated) {
076    }
077  }
078}