PersonEditorWithOptionalAddressEditor editor =
new PersonEditorWithOptionalAddressEditor(addressEditor);
PersonEditorWithOptionalAddressDriver driver =
GWT.create(PersonEditorWithOptionalAddressDriver.class);
driver.initialize(editor);
driver.edit(person);
// Freshly-initialized should not be dirty
assertFalse(driver.isDirty());
// Change the instance being edited