Bug 239015 [Databinding] ObservableListTreeContentProvider adds the value passed to TreeViewer#setInput() to the known-elements
The input element is never shown in the viewer so it should no get part of the knownElements further more it restricts the usability of the content-provider because the input-element itself already has to provide the required Observable-Attribute(s).
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/BindingTestSuite.java
addTest(ObservableViewerElementSetTest.suite());
		addTestSuite(SelectionProviderMultiSelectionObservableListTest.class);
		addTestSuite(SelectionProviderSingleSelectionObservableValueTest.class);
		addTestSuite(ViewerElementMapTest.class);
		addTestSuite(ViewerElementSetTest.class);
		addTestSuite(ViewerElementWrapperTest.class);
		addTest(ViewerInputObservableValueTest.suite());
	}
	/**
	 * @param testCase
	 *            TODO
	 * @return true if the given test is temporarily disabled
	 */
	public static boolean failingTestsDisabled(TestCase testCase) {
		System.out.println("Ignoring disabled test: "
				+ testCase.getClass().getName() + "." + testCase.getName());
		return true;
	}
	/**
	 * @param testSuite
	 *            TODO
	 * @return true if the given test is temporarily disabled
	 */
	public static boolean failingTestsDisabled(TestSuite testSuite) {
		System.out.println("Ignoring disabled test: "
				+ testSuite.getClass().getName() + "." + testSuite.getName());
		return true;
	}
}