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<plugin id="orgeclipsecontributionjunit" name="JUnit Plug-in" version="100" class="orgeclipsecontributionjunitJUnitPlugin"> Finally, we need a little stub for running tests:
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orgeclipsecontributionjunit/JUnitPlugin
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public void run(IType type) { // TODO run the tests in the given type } Our menu item will run now, but it won't do anything We'll implement displaying test results in the next chapter First, reviewing: We saw that our RunAction wasn't created until the menu item was selected We saw how the selection is passed as part of selectionChanged(), but used in run() These are the only two methods needed to
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act as the action behind a menu item We introduced the plug-in class
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Dynamic enablement and label changes Once your plug-in is loaded, you can update the enablement state or the label precisely from code To do so, you get the generic IAction passed in to both ActionDelegate methods Contributing a set of actions in a submenu To do so, you describe a menu contribution with a path, which you then use for contributing actions:
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<menu id="aSubMenu" path="additions" label="A Submenu"> <separator name="someGroup"/> </menu> Other examples of the Lazy Loading Rule Preference pages are also loaded lazily Look carefully The first time you click on a preference node, there is a brief pause while Eclipse loads the preference page Subsequently the page loads instantly
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7 Displaying the Results
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We left the last chapter having invoked the tests In this chapter, we will
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Design the protocol for collecting test results Outline what it takes to actually run the tests Display the test results
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How are we going to display the results The JUnit plug-in class should know nothing about how results are displayed So, what if the plug-in class broadcasts the results of tests that are running The Observer pattern is useful when you have loosely coupled communication patterns:
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You don't care in what order the receivers receive the messages You don't have to return any results to the sender You don't know a priori how many objects will want to receive the message (seeFigure 71)
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Figure 71 One Subject Notifies Several Observers
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These conditions hold in our case Tests will run and various observers will respond to notifications of progress (see Figure 72) The role of the Observer will be played by our RunTestAction at first, later also by a view, a tabular report view, and so on The Observer Interface will contain the set of progress messages: "The tests are starting," "The tests are done," "A test has started," and "A test has failed"
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Figure 72 One TestRunner Notifies Its Observers
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How would this look in the code we've written so far
Before we ask the JUnit plug-in to run the tests, we should connect a listener to the plug-in The plug-in acts as a Subject in the Observer pattern The listener will be notified as tests run When the last test runs, the listener will pop up a dialog containing the results We will disconnect the listener
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First, we need to change the calling sequence in the action Before we run tests, we need to register a listener, and afterward we need to unregister a listener What object should play the part of the listener A clever solution is to have our ActionDelegate also implement ITestRunListener However, this requires us to make the listener methods public inRunTestAction, and we don't really want to publicize the test listener methods as part of the action Instead, we'll implement the listener as a static inner class Let's start with the code to register the listener in the run() method:
orgeclipsecontributionjunit/RunTestAction
public void run(IAction action) { if (! (selection instanceof IStructuredSelection)) return; IStructuredSelection structured= (IStructuredSelection) selection; IType type= (IType) structuredgetFirstElement();
ITestRunListener listener= new Listener(); JUnitPlugingetPlugin()addTestListener(listener);
JUnitPlugingetPlugin()run(type);
JUnitPlugingetPlugin()removeTestListener(listener);
The listener will need to respond to the progress of the tests We'll represent the messages being broadcast as an interface:
orgeclipsecontributionjunit/ITestRunListener
public interface ITestRunListener { void testsStarted(int testCount); void testsFinished(); void testStarted(String klass, String method); void testFailed(String klass, String method, String trace); } Next we implement the Listener as a static inner class inRunTestAction If we want to pop up a dialog with "Pass" or "Fail" when the tests finish, we need to set a flag when the tests start and clear it if a test ever fails: