@Test public void testFilter() throws CoreException { IPerspectiveDescriptor persDescription = PlatformUI.getWorkbench() .getPerspectiveRegistry() .findPerspectiveWithId(JavaUI.ID_PERSPECTIVE); IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(); page.setPerspective(persDescription); IViewPart arquilliaView = page.showView(ArquillianView.ID); try { assertTrue(arquilliaView instanceof CommonNavigator); PackageExplorerPart packageView = (PackageExplorerPart) page.showView(JavaUI.ID_PACKAGES); IProject project = getProject(TEST_PROJECT_NAME); packageView.selectAndReveal(project); CommonNavigator navigator = (CommonNavigator) arquilliaView; CommonViewer viewer = navigator.getCommonViewer(); TreeItem[] items = viewer.getTree().getItems(); assertTrue(items.length == 1); ViewerFilter[] filters = viewer.getFilters(); assertTrue(filters.length > 0); WorkingSetFilter activeFilter = null; List<ViewerFilter> newFilters = new ArrayList<ViewerFilter>(); int i = 0; for (ViewerFilter filter : filters) { if (!(filter instanceof ActiveProjectFilter)) { newFilters.add(filter); } } newFilters.add(new WorkingSetFilter()); viewer.setFilters(newFilters.toArray(new ViewerFilter[0])); items = viewer.getTree().getItems(); assertTrue("Invalid filter", items.length == 2); } finally { if (arquilliaView != null) { page.hideView(arquilliaView); } } }