simulateAuthStateChange method
상태 변경 이벤트 발생 (Widget 테스트용)
await tester.pumpWidget(MyApp(kAuth: mockKAuth));
mockKAuth.simulateAuthStateChange(newUser);
await tester.pump();
expect(find.byType(HomeScreen), findsOneWidget);
Implementation
void simulateAuthStateChange(KAuthUser? user) {
_currentUser = user;
_authStateController.add(user);
}