Java

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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.KNOWN_ORDER;
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import static com.google.common.collect.testing.features.CollectionSize.ONE;
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import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
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import static com.google.common.collect.testing.features.CollectionSize.ZERO;
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import com.google.common.annotations.GwtCompatible;
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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 org.junit.Ignore;
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/**
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 * A generic JUnit test which tests {@code peek()} operations on a queue. Can't be invoked directly;
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 * please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
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 *
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 * @author Jared Levy
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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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@SuppressWarnings("JUnit4ClassUsedInJUnit3")
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public class QueuePeekTester<E> extends AbstractQueueTester<E> {
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  @CollectionSize.Require(ZERO)
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  public void testPeek_empty() {
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    assertNull("emptyQueue.peek() should return null", getQueue().peek());
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    expectUnchanged();
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  }
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  @CollectionSize.Require(ONE)
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  public void testPeek_size1() {
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    assertEquals("size1Queue.peek() should return first element", e0(), getQueue().peek());
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    expectUnchanged();
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  }
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  @CollectionFeature.Require(KNOWN_ORDER)
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  @CollectionSize.Require(SEVERAL)
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  public void testPeek_sizeMany() {
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    assertEquals("sizeManyQueue.peek() should return first element", e0(), getQueue().peek());
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    expectUnchanged();
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  }
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}
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