guava

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/*
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 * Copyright (C) 2008 The Guava Authors
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.google.common.collect.testing.testers;
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import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.collect.testing.Helpers;
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import com.google.common.collect.testing.MinimalSet;
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import com.google.common.collect.testing.features.CollectionFeature;
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import com.google.common.collect.testing.features.CollectionSize;
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import java.util.Collection;
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import java.util.Set;
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import org.junit.Ignore;
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/**
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 * Tests {@link java.util.Set#equals}.
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 *
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 * @author George van den Driessche
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 */
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@GwtCompatible
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@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
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public class SetEqualsTester<E> extends AbstractSetTester<E> {
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  public void testEquals_otherSetWithSameElements() {
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    assertTrue(
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        "A Set should equal any other Set containing the same elements.",
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        getSet().equals(MinimalSet.from(getSampleElements())));
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  }
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  @CollectionSize.Require(absent = CollectionSize.ZERO)
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  public void testEquals_otherSetWithDifferentElements() {
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    Collection<E> elements = getSampleElements(getNumElements() - 1);
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    elements.add(getSubjectGenerator().samples().e3());
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    assertFalse(
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        "A Set should not equal another Set containing different elements.",
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        getSet().equals(MinimalSet.from(elements)));
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  }
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  @CollectionSize.Require(absent = CollectionSize.ZERO)
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  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
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  public void testEquals_containingNull() {
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    Collection<E> elements = getSampleElements(getNumElements() - 1);
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    elements.add(null);
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    collection = getSubjectGenerator().create(elements.toArray());
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    assertTrue(
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        "A Set should equal any other Set containing the same elements,"
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            + " even if some elements are null.",
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        getSet().equals(MinimalSet.from(elements)));
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  }
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  @CollectionSize.Require(absent = CollectionSize.ZERO)
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  public void testEquals_otherContainsNull() {
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    Collection<E> elements = getSampleElements(getNumElements() - 1);
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    elements.add(null);
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    Set<E> other = MinimalSet.from(elements);
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    assertFalse(
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        "Two Sets should not be equal if exactly one of them contains null.",
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        getSet().equals(other));
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  }
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  @CollectionSize.Require(absent = CollectionSize.ZERO)
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  public void testEquals_smallerSet() {
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    Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
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    assertFalse(
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        "Sets of different sizes should not be equal.",
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        getSet().equals(MinimalSet.from(fewerElements)));
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  }
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  public void testEquals_largerSet() {
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    Collection<E> moreElements = getSampleElements(getNumElements() + 1);
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    assertFalse(
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        "Sets of different sizes should not be equal.",
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        getSet().equals(MinimalSet.from(moreElements)));
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  }
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  public void testEquals_list() {
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    assertFalse("A List should never equal a Set.", getSet().equals(Helpers.copyToList(getSet())));
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  }
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}
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