Bug 166600 [DataBinding] Refactor tests to be in the correct packages
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/IDiffsTest.java
/**
	 * Asserts that the {@link SetDiff#toString()} implementation doesn't throw a NPE if any of its properties are <code>null</code>.
	 */
	public void test_SetDiff() {
		SetDiff diff = new SetDiff() {
			public Set getAdditions() {
				return null;
			}
			public Set getRemovals() {
				return null;
			}
		};
		
		try {
			diff.toString();