Coverage Summary for Class: ListAddTester (com.google.common.collect.testing.testers)

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 import java.util.List;
30 import org.junit.Ignore;
31 
32 /**
33  * A generic JUnit test which tests {@code add(Object)} operations on a list. Can't be invoked
34  * directly; please see {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
35  *
36  * @author Chris Povirk
37  */
38 @SuppressWarnings("unchecked") // too many "unchecked generic array creations"
39 @GwtCompatible(emulated = true)
40 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
41 public class ListAddTester<E> extends AbstractListTester<E> {
42   @CollectionFeature.Require(SUPPORTS_ADD)
43   @CollectionSize.Require(absent = ZERO)
44   public void testAdd_supportedPresent() {
45     assertTrue("add(present) should return true", getList().add(e0()));
46     expectAdded(e0());
47   }
48 
49   @CollectionFeature.Require(absent = SUPPORTS_ADD)
50   @CollectionSize.Require(absent = ZERO)
51   /*
52    * absent = ZERO isn't required, since unmodList.add() must
53    * throw regardless, but it keeps the method name accurate.
54    */
55   public void testAdd_unsupportedPresent() {
56     try {
57       getList().add(e0());
58       fail("add(present) should throw");
59     } catch (UnsupportedOperationException expected) {
60     }
61   }
62 
63   @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
64   @CollectionSize.Require(absent = ZERO)
65   public void testAdd_supportedNullPresent() {
66     E[] array = createArrayWithNullElement();
67     collection = getSubjectGenerator().create(array);
68     assertTrue("add(nullPresent) should return true", getList().add(null));
69 
70     List<E> expected = Helpers.copyToList(array);
71     expected.add(null);
72     expectContents(expected);
73   }
74 
75   /**
76    * Returns the {@link Method} instance for {@link #testAdd_supportedNullPresent()} so that tests
77    * can suppress it. See {@link CollectionAddTester#getAddNullSupportedMethod()} for details.
78    */
79   @GwtIncompatible // reflection
80   public static Method getAddSupportedNullPresentMethod() {
81     return Helpers.getMethod(ListAddTester.class, "testAdd_supportedNullPresent");
82   }
83 }