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;
024
025/**
026 * A generic JUnit test which tests {@code isEmpty()} operations on a collection. Can't be invoked
027 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
028 *
029 * @author Kevin Bourrillion
030 */
031@GwtCompatible
032public class CollectionIsEmptyTester<E> extends AbstractCollectionTester<E> {
033  @CollectionSize.Require(ZERO)
034  public void testIsEmpty_yes() {
035    assertTrue("isEmpty() should return true", collection.isEmpty());
036  }
037
038  @CollectionSize.Require(absent = ZERO)
039  public void testIsEmpty_no() {
040    assertFalse("isEmpty() should return false", collection.isEmpty());
041  }
042}