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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.ALLOWS_NULL_VALUES;
import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.MinimalSet;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.util.Collection;
import java.util.Set;
/**
* Tests {@link java.util.Set#equals}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
@GwtCompatible
public class SetEqualsTester<E> extends AbstractSetTester<E> {
public void testEquals_otherSetWithSameElements() {
assertTrue(
"A Set should equal any other Set containing the same elements.",
getSet().equals(MinimalSet.from(getSampleElements())));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherSetWithDifferentElements() {
Collection<E> elements = getSampleElements(getNumElements() - 1);
elements.add(getSubjectGenerator().samples().e3);
assertFalse(
"A Set should not equal another Set containing different elements.",
getSet().equals(MinimalSet.from(elements))
);
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
@CollectionFeature.Require(ALLOWS_NULL_VALUES)
public void testEquals_containingNull() {
Collection<E> elements = getSampleElements(getNumElements() - 1);
elements.add(null);
collection = getSubjectGenerator().create(elements.toArray());
assertTrue("A Set should equal any other Set containing the same elements,"
+ " even if some elements are null.",
getSet().equals(MinimalSet.from(elements)));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherContainsNull() {
Collection<E> elements = getSampleElements(getNumElements() - 1);
elements.add(null);
Set<E> other = MinimalSet.from(elements);
assertFalse(
"Two Sets should not be equal if exactly one of them contains null.",
getSet().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_smallerSet() {
Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
assertFalse("Sets of different sizes should not be equal.",
getSet().equals(MinimalSet.from(fewerElements)));
}
public void testEquals_largerSet() {
Collection<E> moreElements = getSampleElements(getNumElements() + 1);
assertFalse("Sets of different sizes should not be equal.",
getSet().equals(MinimalSet.from(moreElements)));
}
public void testEquals_list() {
assertFalse("A List should never equal a Set.",
getSet().equals(Helpers.copyToList(getSet())));
}
}
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