001/* 002 * Copyright (C) 2007 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.CollectionSize.ZERO; 020 021import com.google.common.annotations.GwtCompatible; 022import com.google.common.collect.testing.AbstractCollectionTester; 023import com.google.common.collect.testing.features.CollectionSize; 024import org.junit.Ignore; 025 026/** 027 * A generic JUnit test which tests {@code isEmpty()} operations on a collection. Can't be invoked 028 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}. 029 * 030 * @author Kevin Bourrillion 031 */ 032@GwtCompatible 033@Ignore("test runners must not instantiate and run this directly, only via suites we build") 034// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 035@SuppressWarnings("JUnit4ClassUsedInJUnit3") 036public class CollectionIsEmptyTester<E> extends AbstractCollectionTester<E> { 037 @CollectionSize.Require(ZERO) 038 public void testIsEmpty_yes() { 039 assertTrue("isEmpty() should return true", collection.isEmpty()); 040 } 041 042 @CollectionSize.Require(absent = ZERO) 043 public void testIsEmpty_no() { 044 assertFalse("isEmpty() should return false", collection.isEmpty()); 045 } 046}