code: /*
   * #%L
   * Simmetrics Core
   * %%
   * Copyright (C) 2014 - 2016 Simmetrics 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.
   * #L%
   */
  
  package org.simmetrics.builders;
  
  import static org.mockito.Matchers.any;
  import static org.mockito.Matchers.anyString;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.times;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  import static org.simmetrics.simplifiers.Simplifiers.toLowerCase;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.ExecutionException;
  
  import org.junit.Test;
  import org.simmetrics.simplifiers.Simplifier;
  import org.simmetrics.simplifiers.SimplifierTest;
  
  import com.google.common.cache.Cache;
  import com.google.common.cache.CacheBuilder;
  
  @SuppressWarnings("javadoc")
  public abstract class CachingSimplifierTest extends SimplifierTest {
  
  	private Simplifier innerSimplifier;
  
  	@Override
  	protected final Simplifier getSimplifier() {
  
  		innerSimplifier = mock(Simplifier.class);
  
  		when(innerSimplifier.simplify("ABC"))
  		.thenReturn("abc");
  		when(innerSimplifier.simplify("CCC"))
  		.thenReturn("ccc");
  		when(innerSimplifier.simplify("EEE"))
  		.thenReturn("eee");
  		when(innerSimplifier.simplify(""))
  		.thenReturn("");
  
  		Cache<String, String> cache = CacheBuilder.newBuilder()
  				.initialCapacity(2)
  				.maximumSize(2)
  				.build();
  
  		return getCachingSimplifier(cache, innerSimplifier);
  	}
  	
  	protected abstract Simplifier getCachingSimplifier(Cache<String,String> cache, Simplifier innerSimplifier);
  
  	@Override
  	protected final T[] getTests() {
  
  		return new T[] { 
  				new T("ABC", "abc"), 
  				new T("CCC", "ccc"),
  				new T("ABC", "abc"), 
  				new T("EEE", "eee"), 
  				new T("ABC", "abc"),
  				new T("CCC", "ccc"), 
  				new T("", "")
  		};
  	}
  
  	@Test
  	public final void simplifyShouldUseCache() {
  		for (T t : tests) {
  			simplifier.simplify(t.string());
  		}
  
  		verify(innerSimplifier, times(1)).simplify("ABC");
  		verify(innerSimplifier, times(2)).simplify("CCC");
  	}
  	
  	@Test(expected=IllegalStateException.class) 
  	public void shouldThrowIllegalStateException() throws ExecutionException{
  		Cache<String, String> cache = mock(Cache.class);
  		when(cache.get(anyString(), any(Callable.class))).thenThrow(new ExecutionException(new Exception()));
  		getCachingSimplifier(cache, toLowerCase()).simplify("Sheep");
  	}
  }
  