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  /*
   * Copyright (C) 2008 The Guava Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package com.google.common.collect.testing.testers;
 
 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
 import static com.google.common.collect.testing.features.MapFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION;
 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
 
 
A generic JUnit test which tests clear() operations on a map. Can't be invoked directly; please see com.google.common.collect.testing.MapTestSuiteBuilder.

Author(s):
George van den Driessche
Chris Povirk
 
 public class MapClearTester<K, V> extends AbstractMapTester<K, V> {
   public void testClear() {
     getMap().clear();
     assertTrue("After clear(), a map should be empty.",
         getMap().isEmpty());
   }
 
       })
     try {
       Iterator<Entry<K, V>> iterator = getMap().entrySet().iterator();
       getMap().clear();
       iterator.next();
       fail("Expected ConcurrentModificationException");
     } catch (ConcurrentModificationException expected) {
       // success
     }
   }
 
       })
     try {
       Iterator<K> iterator = getMap().keySet().iterator();
       getMap().clear();
       iterator.next();
       fail("Expected ConcurrentModificationException");
     } catch (ConcurrentModificationException expected) {
       // success
     }
   }
 
       })
     try {
       Iterator<V> iterator = getMap().values().iterator();
       getMap().clear();
       iterator.next();
       fail("Expected ConcurrentModificationException");
     } catch (ConcurrentModificationException expected) {
       // success
     }
   }
 
   @CollectionSize.Require(absent = )
   public void testClear_unsupported() {
     try {
       getMap().clear();
       fail("clear() should throw UnsupportedOperation if a map does "
           + "not support it and is not empty.");
     } catch (UnsupportedOperationException expected) {
    }
  }
    try {
      getMap().clear();
    } catch (UnsupportedOperationException tolerated) {
    }
  }
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