001/*
002 * Copyright (C) 2008 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
020import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
021import static com.google.common.collect.testing.testers.ReflectionFreeAssertThrows.assertThrows;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.features.CollectionFeature;
025import org.junit.Ignore;
026
027/**
028 * A generic JUnit test which tests offer operations on a queue. Can't be invoked directly; please
029 * see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
030 *
031 * @author Jared Levy
032 */
033@GwtCompatible
034@Ignore("test runners must not instantiate and run this directly, only via suites we build")
035// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
036@SuppressWarnings("JUnit4ClassUsedInJUnit3")
037public class QueueOfferTester<E> extends AbstractQueueTester<E> {
038  @CollectionFeature.Require(SUPPORTS_ADD)
039  public void testOffer_supportedNotPresent() {
040    assertTrue("offer(notPresent) should return true", getQueue().offer(e3()));
041    expectAdded(e3());
042  }
043
044  @CollectionFeature.Require({SUPPORTS_ADD, ALLOWS_NULL_VALUES})
045  public void testOffer_nullSupported() {
046    assertTrue("offer(null) should return true", getQueue().offer(null));
047    expectAdded((E) null);
048  }
049
050  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
051  public void testOffer_nullUnsupported() {
052    assertThrows(NullPointerException.class, () -> getQueue().offer(null));
053    expectUnchanged();
054    expectNullMissingWhenNullUnsupported("Should not contain null after unsupported offer(null)");
055  }
056}