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; 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") 038public class CollectionStreamTester<E> extends AbstractCollectionTester<E> { 039 /* 040 * We're not really testing the implementation of Stream, only that we're getting a Stream 041 * that corresponds to the expected elements. 042 */ 043 044 @CollectionFeature.Require(absent = KNOWN_ORDER) 045 public void testStreamToArrayUnknownOrder() { 046 assertEqualIgnoringOrder(getSampleElements(), asList(collection.stream().toArray())); 047 } 048 049 @CollectionFeature.Require(KNOWN_ORDER) 050 public void testStreamToArrayKnownOrder() { 051 assertEquals(getOrderedElements(), asList(collection.stream().toArray())); 052 } 053 054 public void testStreamCount() { 055 assertEquals(getNumElements(), collection.stream().count()); 056 } 057}