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org.apache.commons.jexl.junit.Asserter |
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1 | /* |
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2 | * Copyright 2003-2006 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | ||
17 | package org.apache.commons.jexl.junit; |
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18 | ||
19 | import java.util.HashMap; |
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20 | import java.util.Map; |
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21 | ||
22 | import junit.framework.Assert; |
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23 | ||
24 | import org.apache.commons.jexl.Expression; |
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25 | import org.apache.commons.jexl.ExpressionFactory; |
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26 | import org.apache.commons.jexl.JexlContext; |
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27 | import org.apache.commons.jexl.JexlHelper; |
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28 | ||
29 | /** |
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30 | * A utility class for performing JUnit based assertions using Jexl |
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31 | * expressions. This class can make it easier to do unit tests using |
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32 | * Jexl navigation expressions. |
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33 | * |
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34 | * @since 1.0 |
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35 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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36 | * @version $Revision: 398153 $ |
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37 | */ |
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38 | public class Asserter extends Assert { |
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39 | ||
40 | /** variables used during asserts. */ |
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41 | 2 | private final Map variables = new HashMap(); |
42 | /** context to use during asserts. */ |
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43 | 2 | private final JexlContext context = JexlHelper.createContext(); |
44 | ||
45 | /** |
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46 | * |
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47 | * Create an asserter. |
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48 | */ |
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49 | 1 | public Asserter() { |
50 | ||
51 | 1 | } |
52 | ||
53 | /** |
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54 | * This constructor will register the given variableValue as the |
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55 | * "this" variable. |
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56 | * |
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57 | * @param variableValue 'this'. |
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58 | */ |
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59 | 1 | public Asserter(Object variableValue) { |
60 | 1 | setVariable("this", variableValue); |
61 | 1 | } |
62 | ||
63 | /** |
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64 | * Performs an assertion that the value of the given Jexl expression |
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65 | * evaluates to the given expected value. |
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66 | * |
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67 | * @param expression is the Jexl expression to evaluate |
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68 | * @param expected is the expected value of the expression |
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69 | * @throws Exception if the expression could not be evaluationed or an assertion |
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70 | * fails |
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71 | */ |
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72 | public void assertExpression(String expression, Object expected) throws Exception { |
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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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82 | * Puts a variable of a certain name in the context so that it can be used from |
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83 | * assertion expressions. |
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84 | * |
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85 | * @param name variable name |
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86 | * @param value variable value |
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87 | */ |
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88 | public void setVariable(String name, Object value) { |
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89 | 3 | variables.put(name, value); |
90 | 3 | } |
91 | ||
92 | } |
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