sign_in_screen_widget_test.dart

/*import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:zip/business/auth.dart';
import 'package:zip/business/validator.dart';
import 'package:flutter/services.dart';
import 'package:zip/ui/screens/sign_in_screen.dart';
import 'package:mockito/mockito.dart';

class MockAuth extends Mock implements AuthService {}
void main() {
 Widget makeTestableWidget({Widget child, AuthService auth}) {
   return GoogleAuthProvider(
     auth: auth,
     child: MaterialApp(
       home: child,
     ),
   );
 }
 testWidgets('email or password is empty, does not sign in', (WidgetTester tester) async {
   MockAuth mockAuth = MockAuth();
   bool didSignIn = false;
   SignInScreen page = SignInScreen(onSignIn: () => didSignIn = true);
   await tester.pumpWidget(makeTestableWidget(child: page, auth: mockAuth));
   await tester.tap(find.byKey(Key('signIn')));
   verifyNever(mockAuth.signInWithEmailAndPassword('', ''));
   expect(didSignIn, false);
 });
 testWidgets('non-empty email and password, valid account, call sign in, succeed', (WidgetTester tester) async {
   MockAuth mockAuth = MockAuth();
   when(mockAuth.signInWithEmailAndPassword('email', 'password')).thenAnswer((invocation) => Future.value('uid'));
   bool didSignIn = false;
   SignInScreen page = SignInScreen(onSignedIn: () => didSignIn = true);
   await tester.pumpWidget(makeTestableWidget(child: page, auth: mockAuth));
   Finder emailField = find.byKey(Key('email'));
   await tester.enterText(emailField, 'email');
   Finder passwordField = find.byKey(Key('password'));
   await tester.enterText(passwordField, 'password');
   await tester.tap(find.byKey(Key('signIn')));
   verify(mockAuth.signInWithEmailAndPassword('email', 'password')).called(1);
   expect(didSignIn, true);
 });
 testWidgets('non-empty email and password, valid account, call sign in, fails', (WidgetTester tester) async {
   MockAuth mockAuth = MockAuth();
   when(mockAuth.signIn('email', 'password')).thenThrow(StateError('invalid credentials'));
   bool didSignIn = false;
   SignInScreen page = SignInScreen(onSignedIn: () => didSignIn = true);
   await tester.pumpWidget(makeTestableWidget(child: page, auth: mockAuth));
   Finder emailField = find.byKey(Key('email'));
   await tester.enterText(emailField, 'email');
   Finder passwordField = find.byKey(Key('password'));
   await tester.enterText(passwordField, 'password');
   await tester.tap(find.byKey(Key('signIn')));
   verify(mockAuth.signInWithEmailAndPassword('email', 'password')).called(1);
   expect(didSignIn, false);
 });
}*/