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.Helpers.assertEqualIgnoringOrder;
020import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
021import static java.util.Arrays.asList;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.AbstractCollectionTester;
025import com.google.common.collect.testing.features.CollectionFeature;
026
027/**
028 * A generic JUnit test which tests {@code stream} operations on a collection. Can't be invoked
029 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
030 *
031 * @author Louis Wasserman
032 */
033@GwtCompatible
034public class CollectionStreamTester<E> extends AbstractCollectionTester<E> {
035  /*
036   * We're not really testing the implementation of Stream, only that we're getting a Stream
037   * that corresponds to the expected elements.
038   */
039
040  @CollectionFeature.Require(absent = KNOWN_ORDER)
041  public void testStreamToArrayUnknownOrder() {
042    assertEqualIgnoringOrder(getSampleElements(), asList(collection.stream().toArray()));
043  }
044
045  @CollectionFeature.Require(KNOWN_ORDER)
046  public void testStreamToArrayKnownOrder() {
047    assertEquals(getOrderedElements(), asList(collection.stream().toArray()));
048  }
049
050  public void testStreamCount() {
051    assertEquals(getNumElements(), collection.stream().count());
052  }
053}