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      1 /*
      2  * Copyright (C) 2007 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing.testers;
     18 
     19 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
     20 
     21 import com.google.common.collect.testing.AbstractCollectionTester;
     22 import com.google.common.collect.testing.features.CollectionSize;
     23 
     24 /**
     25  * A generic JUnit test which tests {@code isEmpty()} operations on a
     26  * collection. Can't be invoked directly; please see
     27  * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
     28  *
     29  * <p>This class is GWT compatible.
     30  *
     31  * @author Kevin Bourrillion
     32  */
     33 public class CollectionIsEmptyTester<E> extends AbstractCollectionTester<E> {
     34   @CollectionSize.Require(ZERO)
     35   public void testIsEmpty_yes() {
     36     assertTrue("isEmpty() should return true", collection.isEmpty());
     37   }
     38 
     39   @CollectionSize.Require(absent = ZERO)
     40   public void testIsEmpty_no() {
     41     assertFalse("isEmpty() should return false", collection.isEmpty());
     42   }
     43 }
     44