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.Map;
031import org.junit.Ignore;
032
033/**
034 * A generic JUnit test which tests {@link Map#replace(Object, Object)}. Can't be invoked directly;
035 * please see {@link com.google.common.collect.testing.ConcurrentMapTestSuiteBuilder}.
036 *
037 * @author Louis Wasserman
038 */
039@GwtCompatible
040@Ignore("test runners must not instantiate and run this directly, only via suites we build")
041// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
042@SuppressWarnings("JUnit4ClassUsedInJUnit3")
043public class MapReplaceTester<K, V> extends AbstractMapTester<K, V> {
044
045  @MapFeature.Require(SUPPORTS_PUT)
046  @CollectionSize.Require(absent = ZERO)
047  public void testReplace_supportedPresent() {
048    try {
049      assertEquals(v0(), getMap().replace(k0(), v3()));
050      expectReplacement(entry(k0(), v3()));
051    } catch (ClassCastException tolerated) { // for ClassToInstanceMap
052      expectUnchanged();
053    }
054  }
055
056  @MapFeature.Require(SUPPORTS_PUT)
057  @CollectionSize.Require(absent = ZERO)
058  public void testReplace_supportedPresentNoChange() {
059    assertEquals(v0(), getMap().replace(k0(), v0()));
060    expectUnchanged();
061  }
062
063  @MapFeature.Require(SUPPORTS_PUT)
064  public void testReplace_supportedAbsent() {
065    assertNull(getMap().replace(k3(), v3()));
066    expectUnchanged();
067  }
068
069  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
070  @CollectionSize.Require(absent = ZERO)
071  public void testReplace_presentNullValueUnsupported() {
072    assertThrows(NullPointerException.class, () -> getMap().replace(k0(), null));
073    expectUnchanged();
074  }
075
076  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUE_QUERIES)
077  public void testReplace_absentNullValueUnsupported() {
078    try {
079      getMap().replace(k3(), null);
080    } catch (NullPointerException tolerated) {
081      // permitted not to throw because it would be a no-op
082    }
083    expectUnchanged();
084  }
085
086  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEY_QUERIES)
087  public void testReplace_absentNullKeyUnsupported() {
088    try {
089      getMap().replace(null, v3());
090    } catch (NullPointerException tolerated) {
091      // permitted not to throw because it would be a no-op
092    }
093    expectUnchanged();
094  }
095
096  @MapFeature.Require(absent = SUPPORTS_PUT)
097  @CollectionSize.Require(absent = ZERO)
098  public void testReplace_unsupportedPresent() {
099    try {
100      getMap().replace(k0(), v3());
101      fail("Expected UnsupportedOperationException");
102    } catch (UnsupportedOperationException expected) {
103    } catch (ClassCastException tolerated) {
104      // for ClassToInstanceMap
105    }
106
107    expectUnchanged();
108  }
109}