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1   /*
2    * Copyright (C) 2008 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.CollectionSize.ZERO;
21  
22  import com.google.common.annotations.GwtCompatible;
23  import com.google.common.annotations.GwtIncompatible;
24  import com.google.common.collect.testing.AbstractCollectionTester;
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 creation (typically through a constructor or
32   * static factory method) of a collection. Can't be invoked directly; please see
33   * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
34   *
35   * @author Chris Povirk
36   */
37  @GwtCompatible(emulated = true)
38  public class CollectionCreationTester<E> extends AbstractCollectionTester<E> {
39    @CollectionFeature.Require(ALLOWS_NULL_VALUES)
40    @CollectionSize.Require(absent = ZERO)
41    public void testCreateWithNull_supported() {
42      E[] array = createArrayWithNullElement();
43      collection = getSubjectGenerator().create(array);
44      expectContents(array);
45    }
46  
47    @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
48    @CollectionSize.Require(absent = ZERO)
49    public void testCreateWithNull_unsupported() {
50      E[] array = createArrayWithNullElement();
51  
52      try {
53        getSubjectGenerator().create(array);
54        fail("Creating a collection containing null should fail");
55      } catch (NullPointerException expected) {
56      }
57    }
58  
59    /**
60     * Returns the {@link Method} instance for {@link
61     * #testCreateWithNull_unsupported()} so that tests can suppress it
62     * with {@code FeatureSpecificTestSuiteBuilder.suppressing()} until <a
63     * href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5045147">Sun
64     * bug 5045147</a> is fixed.
65     */
66    @GwtIncompatible // reflection
67    public static Method getCreateWithNullUnsupportedMethod() {
68      return Helpers.getMethod(CollectionCreationTester.class, "testCreateWithNull_unsupported");
69    }
70  }