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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.SUPPORTS_CLEAR;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import com.google.common.collect.testing.AbstractCollectionTester;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
/**
* A generic JUnit test which tests {@code clear()} 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
*/
public class CollectionClearTester<E> extends AbstractCollectionTester<E> {
@CollectionFeature.Require(SUPPORTS_CLEAR)
public void testClear() {
collection.clear();
assertTrue("After clear(), a collection should be empty.",
collection.isEmpty());
}
@CollectionFeature.Require(absent = SUPPORTS_CLEAR)
@CollectionSize.Require(absent = ZERO)
public void testClear_unsupported() {
try {
collection.clear();
fail("clear() should throw UnsupportedOperation if a collection does "
+ "not support it and is not empty.");
} catch (UnsupportedOperationException expected) {
}
expectUnchanged();
}
@CollectionFeature.Require(absent = SUPPORTS_CLEAR)
@CollectionSize.Require(ZERO)
public void testClear_unsupportedByEmptyCollection() {
try {
collection.clear();
} catch (UnsupportedOperationException tolerated) {
}
expectUnchanged();
}
}
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