public void testDirtyWithOptionalEditor() {
person.address = null;
AddressEditor addressEditor = new AddressEditor();
PersonEditorWithOptionalAddressEditor editor =
new PersonEditorWithOptionalAddressEditor(addressEditor);
PersonEditorWithOptionalAddressDriver driver =
GWT.create(PersonEditorWithOptionalAddressDriver.class);
driver.initialize(editor);
driver.edit(person);