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| Extracting a new method |
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| <h1> |
| Extracting a new method |
| </h1> |
| <p> |
| In this section, you will improve the code of the constructor of <em>junit.framework.TestSuite</em>. |
| To make the intent of the code clearer, you will extract the code that collects test cases |
| from base classes into a new method called <em>collectTestMethods</em>. |
| </p> |
| <ol> |
| <li> |
| In the <em>junit.framework.TestSuite.java</em> file, select the following range of |
| code inside the <em>TestSuite(Class)</em> constructor:<br> |
| <p><code> |
| Class superClass= theClass;<br> |
| Vector names= new Vector();<br> |
| while(Test.class.isAssignableFrom(superClass)) {<br> |
| Method[] methods= superClass.getDeclaredMethods();<br> |
| for (int i= 0; i < methods.length; i++) {<br> |
| addTestMethod(methods[i],names, constructor);<br> |
| }<br> |
| superClass= superClass.getSuperclass();<br> |
| }</code></p> |
| </li> |
| <li> |
| From the selection's context menu in the editor, select <strong>Refactor > Extract Method...</strong>. |
| <p> |
| <img src="images/editor_testsuite_extract_method.png" alt="Context menu extract method"> |
| </p> |
| </li> |
| <li> |
| In the <strong>Method Name</strong> field, type <em>collectInheritedTests</em>. |
| <p> |
| <img src="images/extract_method_dialog.png" alt="Extract method wizard data input page"> |
| </p> |
| </li> |
| <li> |
| To preview the changes, press <strong>Preview></strong>.The preview page displays the |
| changes that will be made. Press <strong>OK</strong> to extract the method. |
| <p> |
| <img src="images/extract_method_preview_dialog.png" alt="Extract method preview page"> |
| </p> |
| </li> |
| <li> |
| Go to the extracted method by selecting it in the Outline view. |
| <p> |
| <img src="images/editor_testsuite_outline_collectinheritedmethod.png" alt="Extracted method"> |
| </p> |
| </li> |
| </ol> |
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