001/*
002 * Copyright (C) 2013 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
020
021import com.google.common.annotations.GwtCompatible;
022import com.google.common.collect.testing.AbstractCollectionTester;
023import com.google.common.collect.testing.Helpers;
024import com.google.common.collect.testing.features.CollectionFeature;
025import java.util.Arrays;
026import org.junit.Ignore;
027
028/**
029 * A generic JUnit test which tests {@code stream} operations on a collection. Can't be invoked
030 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
031 *
032 * @author Louis Wasserman
033 */
034@GwtCompatible
035@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
036public class CollectionStreamTester<E> extends AbstractCollectionTester<E> {
037  /*
038   * We're not really testing the implementation of Stream, only that we're getting a Stream
039   * that corresponds to the expected elements.
040   */
041
042  @CollectionFeature.Require(absent = KNOWN_ORDER)
043  public void testStreamToArrayUnknownOrder() {
044    synchronized (collection) { // to allow Collections.synchronized* tests to pass
045      Helpers.assertEqualIgnoringOrder(
046          getSampleElements(), Arrays.asList(collection.stream().toArray()));
047    }
048  }
049
050  @CollectionFeature.Require(KNOWN_ORDER)
051  public void testStreamToArrayKnownOrder() {
052    synchronized (collection) { // to allow Collections.synchronized* tests to pass
053      assertEquals(getOrderedElements(), Arrays.asList(collection.stream().toArray()));
054    }
055  }
056
057  public void testStreamCount() {
058    synchronized (collection) { // to allow Collections.synchronized* tests to pass
059      assertEquals(getNumElements(), collection.stream().count());
060    }
061  }
062}