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protected void tearDown() throws Exception { testProjectdispose(); } We need a utility method to fetch all the markers representing test failures Each marker type has a unique id We'll use orgeclipsecontributionjunitfailure as the id for markers representing test failures:
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private IMarker[] getFailureMarkers() throws CoreException { IWorkspaceRoot root= ResourcesPlugingetWorkspace()getRoot(); return rootfindMarkers( "orgeclipsecontributionjunitfailure", false, IResourceDEPTH_INFINITE); } We search starting at the workspace root, which is the parent of all resources This ensures we'll get all markers The additional parameters to findMarkers() are:
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A boolean stating whether to search for subtypes Remember that marker types form a lattice In this case, we only want markers we've generated ourselves, not any possible future refinements We can imagine in the future having a subtype for failures (violated assertions) and another for errors (unexpected exceptions) An enumeration for how far down the resource tree to search The values are just this resource, this resource and its immediate children, and all resources
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Now we're ready to write our test
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public void testErrorMarker() throws Exception { JUnitPlugingetPlugin()run(type); IMarker marker= getFailureMarkers()[0]; IMethod method= typegetMethods()[0]; int start= methodgetSourceRange()getOffset(); assertEquals(start, markergetAttribute(IMarkerCHAR_START, 0)); int end= start + methodgetSourceRange()getLength(); assertEquals(end, markergetAttribute(IMarkerCHAR_END, 0)); assertTrue(markerisSubtypeOf( IJavaModelMarkerJAVA_MODEL_PROBLEM_MARKER)); assertEquals(IMarkerSEVERITY_ERROR, markergetAttribute(IMarkerSEVERITY, -1)); } We use the Java model API to find the source range of the failing test method We just created the test class with a single method, so we feel justified in fetching the first method We check the marker attributes that position the marker in the source text Selecting the marker should select the whole failing test Another attribute we care about is the type of the marker The type should be a kind of Java model problem This ensures that all the other Eclipse behaviors, like annotating icons in the package explorer with error ticks, will work correctly The final attribute is the severity, which needs to be SEVERITY_ ERROR to get the correct error indication This seems to us like a lot to test for in one test We took a few iterations before we discovered exactly which attributes were important to make the failure markers behave like compile errors We added the assertions one at a time until the marker behaved as expected
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The test fails How are we going to implement it First, we need a refactoring We need to know the project within which tests are running Imagine we had ten different projects and tests were running simultaneously for all of them When we started the tests for the tenth project, we would want to delete the markers, for just that project, in much the same way the compiler deletes the markers for a compilation unit when it begins to compile We need to extend the API of test running in JUnitPlugin to take the project into account In JUnitPluginrun(IType), since there is only one test class being run, the project is not ambiguous:
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public void run(IType type) throws CoreException { new TestRunner()run(new IType[] {type}, typegetJavaProject() ); } The TestRunner will save the project within which tests are running and pass it as a parameter when it wants to broadcast progress to the test listeners
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public class TestRunner { private IJavaProject project; public TestRunner(IJavaProject project) { thisproject= project; } } We need to pass the project along to the various fire* methods in JUnitPlugin Use Change Method Signature to add a parameter to each of these methods (see Figure 162)
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We set the default value of the parameter to FIXME so the compiler reminds us with errors in the Task view which calls we have to revisit to fill in the value of the new argument
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private void parseMessage (String line) { JUnitPlugingetPlugin()fireTestsFinished( project); } Finally, use Change Method Signature to add a parameter to each of theITestRunListener methods
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