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Java example source code file (ListEqualsTester.java)
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The ListEqualsTester.java Java example source code
/*
* 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.MinimalSet;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Tests {@link List#equals}.
*
* @author George van den Driessche
*/
@GwtCompatible
public class ListEqualsTester<E> extends AbstractListTester {
public void testEquals_otherListWithSameElements() {
assertTrue(
"A List should equal any other List containing the same elements.",
getList().equals(new ArrayList<E>(getOrderedElements())));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherListWithDifferentElements() {
ArrayList<E> other = new ArrayList(getSampleElements());
other.set(other.size() / 2, getSubjectGenerator().samples().e3());
assertFalse(
"A List should not equal another List containing different elements.",
getList().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_otherListContainingNull() {
List<E> other = new ArrayList(getSampleElements());
other.set(other.size() / 2, null);
assertFalse(
"Two Lists should not be equal if exactly one of them has null at a given index.",
getList().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
@CollectionFeature.Require(ALLOWS_NULL_VALUES)
public void testEquals_containingNull() {
ArrayList<E> elements = new ArrayList(getSampleElements());
elements.set(elements.size() / 2, null);
collection = getSubjectGenerator().create(elements.toArray());
List<E> other = new ArrayList(getSampleElements());
assertFalse(
"Two Lists should not be equal if exactly one of them has null at a given index.",
getList().equals(other));
}
@CollectionSize.Require(absent = CollectionSize.ZERO)
public void testEquals_shorterList() {
Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
assertFalse(
"Lists of different sizes should not be equal.",
getList().equals(new ArrayList<E>(fewerElements)));
}
public void testEquals_longerList() {
Collection<E> moreElements = getSampleElements(getNumElements() + 1);
assertFalse(
"Lists of different sizes should not be equal.",
getList().equals(new ArrayList<E>(moreElements)));
}
public void testEquals_set() {
assertFalse("A List should never equal a Set.", getList().equals(MinimalSet.from(getList())));
}
}
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