Bug 217801 [CommonNavigator] Capability filtering of commonWizard extensions uses wrong identifier
tests/org.eclipse.ui.tests.navigator/src/org/eclipse/ui/tests/navigator/OpenTest.java
contentService.getActivationService().activateExtensions(
				new String[] { COMMON_NAVIGATOR_RESOURCE_EXT }, true); 
		viewer.refresh();
		viewer.expandAll();
		TreeItem[] items = viewer.getTree().getItems();
		assertTrue("There should be some items.", items.length > 0); 		
		assertEquals(project, items[0].getData());
		
		viewer
				.setSelection(new StructuredSelection(project
						.getFile(".project"))); 
		TreeItem[] children = items[0].getItems();
		assertEquals(expectedChildren.size(), children.length);
		for (int i = 0; i < children.length; i++) {
			assertTrue(expectedChildren.contains(children[i].getData()));
		}
	}
	public void testNavigatorExtensionEnablement() throws Exception { 
		contentService.getActivationService().activateExtensions(new String[] {}, true);
		viewer.refresh();
		viewer.expandAll();
		TreeItem[] items = viewer.getTree().getItems();
		assertTrue("There should be NO items.", items.length == 0); 
		contentService.getActivationService().deactivateExtensions(new String[] {}, true);
		viewer.expandToLevel(2);
		items = viewer.getTree().getItems();
		assertTrue("There should be some items.", items.length > 0); 
	}
}