001/*
002 * Copyright (C) 2007 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_KEYS;
021import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.AbstractMapTester;
025import com.google.common.collect.testing.WrongType;
026import com.google.common.collect.testing.features.CollectionSize;
027import com.google.common.collect.testing.features.MapFeature;
028import org.junit.Ignore;
029
030/**
031 * A generic JUnit test which tests {@code get} operations on a map. Can't be invoked directly;
032 * please see {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
033 *
034 * @author Kevin Bourrillion
035 * @author Chris Povirk
036 */
037@GwtCompatible
038@Ignore("test runners must not instantiate and run this directly, only via suites we build")
039// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
040@SuppressWarnings("JUnit4ClassUsedInJUnit3")
041public class MapGetTester<K, V> extends AbstractMapTester<K, V> {
042  @CollectionSize.Require(absent = ZERO)
043  public void testGet_yes() {
044    assertEquals("get(present) should return the associated value", v0(), get(k0()));
045  }
046
047  public void testGet_no() {
048    assertNull("get(notPresent) should return null", get(k3()));
049  }
050
051  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
052  public void testGet_nullNotContainedButAllowed() {
053    assertNull("get(null) should return null", get(null));
054  }
055
056  @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
057  public void testGet_nullNotContainedAndUnsupported() {
058    try {
059      assertNull("get(null) should return null or throw", get(null));
060    } catch (NullPointerException tolerated) {
061    }
062  }
063
064  @MapFeature.Require(ALLOWS_NULL_KEYS)
065  @CollectionSize.Require(absent = ZERO)
066  public void testGet_nonNullWhenNullContained() {
067    initMapWithNullKey();
068    assertNull("get(notPresent) should return null", get(k3()));
069  }
070
071  @MapFeature.Require(ALLOWS_NULL_KEYS)
072  @CollectionSize.Require(absent = ZERO)
073  public void testGet_nullContained() {
074    initMapWithNullKey();
075    assertEquals("get(null) should return the associated value", getValueForNullKey(), get(null));
076  }
077
078  public void testGet_wrongType() {
079    try {
080      assertNull("get(wrongType) should return null or throw", getMap().get(WrongType.VALUE));
081    } catch (ClassCastException tolerated) {
082    }
083  }
084}