SetAddTester.java revision 3c77433663281544363151bf284b0240dfd22a42 
1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect.testing.testers;
18
19import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
20import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
21import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22
23import com.google.common.annotations.GwtCompatible;
24import com.google.common.annotations.GwtIncompatible;
25import com.google.common.collect.testing.Helpers;
26import com.google.common.collect.testing.features.CollectionFeature;
27import com.google.common.collect.testing.features.CollectionSize;
28
29import java.lang.reflect.Method;
30
31/**
32 * A generic JUnit test which tests add operations on a set. Can't be
33 * invoked directly; please see
34 * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
35 *
36 * <p>This class is GWT compatible.
37 *
38 * @author Kevin Bourrillion
39 */
40@GwtCompatible(emulated = true)
41public class SetAddTester<E> extends AbstractSetTester<E> {
42  @CollectionFeature.Require(SUPPORTS_ADD)
43  @CollectionSize.Require(absent = ZERO)
44  public void testAdd_supportedPresent() {
45    assertFalse("add(present) should return false", getSet().add(samples.e0));
46    expectUnchanged();
47  }
48
49  @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
50  @CollectionSize.Require(absent = ZERO)
51  public void testAdd_supportedNullPresent() {
52    E[] array = createArrayWithNullElement();
53    collection = getSubjectGenerator().create(array);
54    assertFalse("add(nullPresent) should return false", getSet().add(null));
55    expectContents(array);
56  }
57
58  /**
59   * Returns the {@link Method} instance for
60   * {@link #testAdd_supportedNullPresent()} so that tests can suppress it. See
61   * {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
62   */
63  @GwtIncompatible("reflection")
64  public static Method getAddSupportedNullPresentMethod() {
65    return Helpers.getMethod(SetAddTester.class, "testAdd_supportedNullPresent");
66  }
67}
68