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;
020import static java.util.Arrays.asList;
021
022import com.google.common.annotations.GwtCompatible;
023import com.google.common.collect.testing.AbstractCollectionTester;
024import com.google.common.collect.testing.Helpers;
025import com.google.common.collect.testing.features.CollectionFeature;
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("test runners must not instantiate and run this directly, only via suites we build")
036// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
037@SuppressWarnings("JUnit4ClassUsedInJUnit3")
038@IgnoreJRERequirement // We opt into library desugaring for our tests.
039public class CollectionStreamTester<E> extends AbstractCollectionTester<E> {
040  /*
041   * We're not really testing the implementation of Stream, only that we're getting a Stream
042   * that corresponds to the expected elements.
043   */
044
045  @CollectionFeature.Require(absent = KNOWN_ORDER)
046  public void testStreamToArrayUnknownOrder() {
047    Helpers.assertEqualIgnoringOrder(getSampleElements(), asList(collection.stream().toArray()));
048  }
049
050  @CollectionFeature.Require(KNOWN_ORDER)
051  public void testStreamToArrayKnownOrder() {
052    assertEquals(getOrderedElements(), asList(collection.stream().toArray()));
053  }
054
055  public void testStreamCount() {
056    assertEquals(getNumElements(), collection.stream().count());
057  }
058}