Bug 166600 [DataBinding] Refactor tests to be in the correct packages
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/observable/set/WritableSetRealmTest.java
protected IObservableSet doCreateSet() {
		return new WritableSetStub();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.tests.databinding.observable.set.AbstractObservableSetRealmTestCase#isMutable()
	 */
	protected boolean isMutable() {
		return true;
	}
	
	private static class WritableSetStub extends WritableSet {
		public void getterCalled() {
			super.getterCalled();
		}
		
		public void fireSetChange(SetDiff diff) {
			super.fireSetChange(diff);
		}
	}
}