Coverage report

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org.apache.commons.jexl.junit.Asserter
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 1  
 /*
 2  
  * Copyright 2003-2006 The Apache Software Foundation.
 3  
  *
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  * 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  
  */
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 17  
 package org.apache.commons.jexl.junit;
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 19  
 import java.util.HashMap;
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 import java.util.Map;
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 22  
 import junit.framework.Assert;
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 24  
 import org.apache.commons.jexl.Expression;
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 import org.apache.commons.jexl.ExpressionFactory;
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 import org.apache.commons.jexl.JexlContext;
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 import org.apache.commons.jexl.JexlHelper;
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 29  
 /**
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  * A utility class for performing JUnit based assertions using Jexl
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  * expressions. This class can make it easier to do unit tests using
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  * Jexl navigation expressions.
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  *
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  * @since 1.0
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  * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
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  * @version $Revision: 398153 $
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  */
 38  
 public class Asserter extends Assert {
 39  
 
 40  
     /** variables used during asserts. */
 41  2
     private final Map variables = new HashMap();
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     /** context to use during asserts. */
 43  2
     private final JexlContext context = JexlHelper.createContext();
 44  
 
 45  
     /**
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      * 
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      * Create an asserter.
 48  
      */
 49  1
     public Asserter() {
 50  
 
 51  1
     }
 52  
 
 53  
     /**
 54  
      * This constructor will register the given variableValue as the
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      * "this" variable.
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      * 
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      * @param variableValue 'this'.
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      */
 59  1
     public Asserter(Object variableValue) {
 60  1
         setVariable("this", variableValue);
 61  1
     }
 62  
 
 63  
     /**
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      * Performs an assertion that the value of the given Jexl expression 
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      * evaluates to the given expected value.
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      * 
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      * @param expression is the Jexl expression to evaluate
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      * @param expected is the expected value of the expression
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      * @throws Exception if the expression could not be evaluationed or an assertion
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      * fails
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      */
 72  
     public void assertExpression(String expression, Object expected) throws Exception {
 73  7
         Expression exp = ExpressionFactory.createExpression(expression);
 74  
 
 75  7
         context.setVars(variables);
 76  7
         Object value = exp.evaluate(context);
 77  
 
 78  7
         assertEquals("expression: " + expression, expected, value);
 79  5
     }
 80  
 
 81  
     /**
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      * Puts a variable of a certain name in the context so that it can be used from
 83  
      * assertion expressions.
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      * 
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      * @param name variable name
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      * @param value variable value
 87  
      */
 88  
     public void setVariable(String name, Object value) {
 89  3
         variables.put(name, value);
 90  3
     }
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 }

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