001/*
002 * Copyright (C) 2015 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.CollectionSize.ZERO;
020import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
021import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
022import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUE_QUERIES;
023import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT;
024import static com.google.common.collect.testing.testers.ReflectionFreeAssertThrows.assertThrows;
025
026import com.google.common.annotations.GwtCompatible;
027import com.google.common.collect.testing.AbstractMapTester;
028import com.google.common.collect.testing.features.CollectionSize;
029import com.google.common.collect.testing.features.MapFeature;
030import java.util.concurrent.ConcurrentMap;
031import org.junit.Ignore;
032
033/**
034 * A generic JUnit test which tests {@code replace(K, V)} operations on a concurrent map. Can't be
035 * invoked directly; please see {@link
036 * com.google.common.collect.testing.ConcurrentMapTestSuiteBuilder}.
037 *
038 * @author Louis Wasserman
039 */
040@GwtCompatible
041@Ignore("test runners must not instantiate and run this directly, only via suites we build")
042// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
043@SuppressWarnings("JUnit4ClassUsedInJUnit3")
044@ElementTypesAreNonnullByDefault
045public class ConcurrentMapReplaceTester<K, V> extends AbstractMapTester<K, V> {
046  @Override
047  protected ConcurrentMap<K, V> getMap() {
048    return (ConcurrentMap<K, V>) super.getMap();
049  }
050
051  @MapFeature.Require(SUPPORTS_PUT)
052  @CollectionSize.Require(absent = ZERO)
053  public void testReplace_supportedPresent() {
054    assertEquals(v0(), getMap().replace(k0(), v3()));
055    expectReplacement(entry(k0(), v3()));
056  }
057
058  @MapFeature.Require(SUPPORTS_PUT)
059  @CollectionSize.Require(absent = ZERO)
060  public void testReplace_supportedPresentNoChange() {
061    assertEquals(v0(), getMap().replace(k0(), v0()));
062    expectUnchanged();
063  }
064
065  @MapFeature.Require(SUPPORTS_PUT)
066  public void testReplace_supportedAbsent() {
067    assertNull(getMap().replace(k3(), v3()));
068    expectUnchanged();
069  }
070
071  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
072  @CollectionSize.Require(absent = ZERO)
073  public void testReplace_presentNullValueUnsupported() {
074    assertThrows(NullPointerException.class, () -> getMap().replace(k0(), null));
075    expectUnchanged();
076  }
077
078  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUE_QUERIES)
079  public void testReplace_absentNullValueUnsupported() {
080    try {
081      getMap().replace(k3(), null);
082    } catch (NullPointerException tolerated) {
083      // permitted not to throw because it would be a no-op
084    }
085    expectUnchanged();
086  }
087
088  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEY_QUERIES)
089  public void testReplace_absentNullKeyUnsupported() {
090    try {
091      getMap().replace(null, v3());
092    } catch (NullPointerException tolerated) {
093      // permitted not to throw because it would be a no-op
094    }
095    expectUnchanged();
096  }
097
098  @MapFeature.Require(absent = SUPPORTS_PUT)
099  @CollectionSize.Require(absent = ZERO)
100  public void testReplace_unsupportedPresent() {
101    assertThrows(UnsupportedOperationException.class, () -> getMap().replace(k0(), v3()));
102    expectUnchanged();
103  }
104}