Testing in Flutter

Sep 19 2023 · Dart 2.19.3, Flutter 3.7.6, Android Studio 2021.3.1, Visual Studio Code 1.7.4

Part 3: Write Widget Tests

11. Test Different Login Scenarios

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Previous episode: 10. Find & Pump Widget Next episode: 12. Mock Quotes Data & Override Riverpod Dependencies

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In the last episode, we checked if all the widgets are present on the login screen. Now test lets test the login screen with different scenarios. The first scenario is when the user enters invalid credentials.

await tester.enterText(emailTextField, 'abcd');
await tester.enterText(passwordTextField, '1234');

await tester.tap(loginButton);

await tester.pumpAndSettle();
var emailErrorText = find.text(kEmailErrorText);
var passwordErrorText = find.text(kPasswordErrorText);

expect(emailErrorText, findsOneWidget);
expect(passwordErrorText, findsOneWidget);

await tester.enterText(emailTextField, 'abcd@mail.com');
await tester.enterText(passwordTextField, 'abcd1234');

await tester.tap(loginButton);
await tester.pumpAndSettle();
emailErrorText = find.text(kEmailErrorText);
passwordErrorText = find.text(kPasswordErrorText);

expect(emailErrorText, findsNothing);
expect(passwordErrorText, findsNothing);

await tester.enterText(emailTextField, 'abcd@mail.com');
await tester.enterText(passwordTextField, 'abcd1234');

await tester.tap(loginButton);
await tester.pumpAndSettle();
expect(find.byKey(loginCircularProgressKey), findsOneWidget);



  await tester.enterText(emailTextField, 'abcd@mail.com');
  await tester.enterText(passwordTextField, 'abcd1234');
  await doGolden('Login-Page', 'Valid Credentials', testCaseScreenInfo);

  await tester.tap(loginButton);
  await tester.pump(const Duration(seconds: 1));
  expect(find.byKey(loginCircularProgressKey), findsOneWidget);

  await tester.pump(Duration(seconds: 1));
  expect(find.byKey(loginCircularProgressKey), findsNothing);