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1   /*
2    * Copyright (C) 2013 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.KNOWN_ORDER;
20  
21  import com.google.common.annotations.GwtCompatible;
22  import com.google.common.collect.testing.AbstractCollectionTester;
23  import com.google.common.collect.testing.Helpers;
24  import com.google.common.collect.testing.features.CollectionFeature;
25  import java.util.Arrays;
26  
27  /**
28   * A generic JUnit test which tests {@code stream} operations on a collection.
29   * Can't be invoked directly; please see
30   * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
31   *
32   * @author Louis Wasserman
33   */
34  @GwtCompatible
35  public class CollectionStreamTester<E> extends AbstractCollectionTester<E> {
36    /*
37     * We're not really testing the implementation of Stream, only that we're getting a Stream
38     * that corresponds to the expected elements.
39     */
40  
41    @CollectionFeature.Require(absent = KNOWN_ORDER)
42    public void testStreamToArrayUnknownOrder() {
43      synchronized (collection) { // to allow Collections.synchronized* tests to pass
44        Helpers.assertEqualIgnoringOrder(
45            getSampleElements(), Arrays.asList(collection.stream().toArray()));
46      }
47    }
48  
49    @CollectionFeature.Require(KNOWN_ORDER)
50    public void testStreamToArrayKnownOrder() {
51      synchronized (collection) { // to allow Collections.synchronized* tests to pass
52        assertEquals(getOrderedElements(), Arrays.asList(collection.stream().toArray()));
53      }
54    }
55  
56    public void testStreamCount() {
57      synchronized (collection) { // to allow Collections.synchronized* tests to pass
58        assertEquals(getNumElements(), collection.stream().count());
59      }
60    }
61  }