new DartIntroduceOperation(myFixture.getProject(), myFixture.getEditor(), myFixture.getFile(), "a");
introduceOperation.setReplaceAll(true);
if (customization != null) {
customization.consume(introduceOperation);
}
handler.performAction(introduceOperation);
TemplateState state = TemplateManagerImpl.getTemplateState(myFixture.getEditor());
assert state != null;
state.gotoEnd(false);
myFixture.checkResultByFile(name + ".after" + getFileExtension(), true);