Bug 166600 [DataBinding] Refactor tests to be in the correct packages
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/observable/list/WritableListTest.java
protected void tearDown() throws Exception {
		RealmTester.setDefault(null);
	}
	public void testClear() {
		ThreadRealm realm = new ThreadRealm();
		realm.init(Thread.currentThread());
		WritableList writableList = new WritableList(realm);
		writableList.add("hello");
		writableList.add("world");
		assertEquals(2, writableList.size());
		writableList.clear();
		assertEquals(0, writableList.size());
	}
    
    public void testRemoveAllChangeEvent() throws Exception {
        CurrentRealm realm = new CurrentRealm(true);
        
        WritableList list = new WritableList(realm);
        String element = "element";
        
        list.add(element);
        
        class ListChangeListener implements IListChangeListener {