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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  
17  package com.google.common.collect.testing.testers;
18  
19  import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
20  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
21  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22  
23  import com.google.common.annotations.GwtCompatible;
24  import com.google.common.annotations.GwtIncompatible;
25  import com.google.common.collect.testing.Helpers;
26  import com.google.common.collect.testing.features.CollectionFeature;
27  import com.google.common.collect.testing.features.CollectionSize;
28  import java.lang.reflect.Method;
29  
30  /**
31   * A generic JUnit test which tests add operations on a set. Can't be
32   * invoked directly; please see
33   * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
34   *
35   * @author Kevin Bourrillion
36   */
37  @GwtCompatible(emulated = true)
38  public class SetAddTester<E> extends AbstractSetTester<E> {
39    @CollectionFeature.Require(SUPPORTS_ADD)
40    @CollectionSize.Require(absent = ZERO)
41    public void testAdd_supportedPresent() {
42      assertFalse("add(present) should return false", getSet().add(e0()));
43      expectUnchanged();
44    }
45  
46    @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
47    @CollectionSize.Require(absent = ZERO)
48    public void testAdd_supportedNullPresent() {
49      E[] array = createArrayWithNullElement();
50      collection = getSubjectGenerator().create(array);
51      assertFalse("add(nullPresent) should return false", getSet().add(null));
52      expectContents(array);
53    }
54  
55    /**
56     * Returns the {@link Method} instance for
57     * {@link #testAdd_supportedNullPresent()} so that tests can suppress it. See
58     * {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
59     */
60    @GwtIncompatible // reflection
61    public static Method getAddSupportedNullPresentMethod() {
62      return Helpers.getMethod(SetAddTester.class, "testAdd_supportedNullPresent");
63    }
64  }