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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_QUERIES;
import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import com.google.common.collect.testing.AbstractCollectionTester;
import com.google.common.collect.testing.WrongType;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.util.Iterator;
/**
* A generic JUnit test which tests {@code remove} operations on a collection.
* Can't be invoked directly; please see
* {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
public class CollectionRemoveTester<E> extends AbstractCollectionTester<E> {
@CollectionFeature.Require(SUPPORTS_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testRemove_present() {
int initialSize = collection.size();
assertTrue("remove(present) should return true",
collection.remove(samples.e0));
assertEquals("remove(present) should decrease a collection's size by one.",
initialSize - 1, collection.size());
expectMissing(samples.e0);
}
@CollectionFeature.Require(SUPPORTS_REMOVE)
public void testRemove_notPresent() {
assertFalse("remove(notPresent) should return false",
collection.remove(samples.e3));
expectUnchanged();
}
@CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_VALUES})
@CollectionSize.Require(absent = ZERO)
public void testRemove_nullPresent() {
collection = getSubjectGenerator().create(createArrayWithNullElement());
int initialSize = collection.size();
assertTrue("remove(null) should return true", collection.remove(null));
assertEquals("remove(present) should decrease a collection's size by one.",
initialSize - 1, collection.size());
expectMissing((E) null);
}
@CollectionFeature.Require(absent = SUPPORTS_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testRemove_unsupported() {
try {
collection.remove(samples.e0);
fail("remove(present) should throw UnsupportedOperationException");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
assertTrue("remove(present) should not remove the element",
collection.contains(samples.e0));
}
@CollectionFeature.Require(absent = SUPPORTS_REMOVE)
public void testRemove_unsupportedNotPresent() {
try {
assertFalse("remove(notPresent) should return false or throw "
+ "UnsupportedOperationException",
collection.remove(samples.e3));
} catch (UnsupportedOperationException tolerated) {
}
expectUnchanged();
expectMissing(samples.e3);
}
@CollectionFeature.Require(
value = SUPPORTS_REMOVE,
absent = ALLOWS_NULL_QUERIES)
public void testRemove_nullNotSupported() {
try {
assertFalse("remove(null) should return false or throw "
+ "NullPointerException",
collection.remove(null));
} catch (NullPointerException tolerated) {
}
expectUnchanged();
}
@CollectionFeature.Require({SUPPORTS_REMOVE, ALLOWS_NULL_QUERIES})
public void testRemove_nullAllowed() {
assertFalse("remove(null) should return false", collection.remove(null));
expectUnchanged();
}
@CollectionFeature.Require(absent = SUPPORTS_REMOVE)
@CollectionSize.Require(absent = ZERO)
public void testIteratorRemove_unsupported() {
Iterator<E> iterator = collection.iterator();
iterator.next();
try {
iterator.remove();
fail("iterator.remove() should throw UnsupportedOperationException");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
assertTrue(collection.contains(samples.e0));
}
@CollectionFeature.Require(SUPPORTS_REMOVE)
public void testRemove_wrongType() {
try {
assertFalse(collection.remove(WrongType.VALUE));
} catch (ClassCastException tolerated) {
}
expectUnchanged();
}
}
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