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

10. Find & Pump Widget

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Previous episode: 09. Write Login Widget Test Next episode: 11. Test Different Login Scenarios

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Now that we know how to test a text widget. Let’s find other ways to find a widget in the Widget tree.

testWidgets('Login Widget Test', (WidgetTester tester) async {
  await tester.pumpWidget(MaterialApp(home: LoginScreen()));
  expect(find.byType(Text), findsOneWidget);
});
testWidgets('Login Widget Test', (WidgetTester tester) async {
  await tester.pumpWidget(MaterialApp(home: LoginScreen()));
  expect(find.byType(Text), findsNWidgets(4));
});
testWidgets('Login Widget Test', (WidgetTester tester) async {
  await tester.pumpWidget(MaterialApp(home: LoginScreen()));
  expect(find.byKey(ValueKey('loginScreenTextKey')), findsOneWidget);
});
const loginScreenTextKey = ValueKey('loginScreenTextKey');
const emailTextFormKey = ValueKey('emailTextFormKey');
const passwordTextFormKey = ValueKey('passwordTextFormKey');
const loginButtonKey = ValueKey('loginButtonKey');
const loginCircularProgressKey = ValueKey('loginCircularProgressKey');
const loginButtonTextKey = ValueKey('loginButtonTextKey');
const quotesCircularProgressKey = ValueKey('quotesCircularProgressKey');

const kEmailErrorText = 'Please enter a valid email';
const kPasswordErrorText = 'Password must be at least 6 characters';
  Padding(
    padding: const EdgeInsets.all(10.0),
    child: Text(
      'Login Screen',
      key: loginScreenTextKey,
      style: TextStyle(color: Colors.black, fontSize: 20),
      ),
    ),

testWidgets('Login Widget Test', (WidgetTester tester) async {
  await tester.pumpWidget(MaterialApp(home: LoginScreen()));
  final loginText = find.byKey(loginScreenTextKey);
  expect(loginText, findsOneWidget);
});
testWidgets('Login Widget Test', (WidgetTester tester) async {
  await tester.pumpWidget(MaterialApp(home: LoginScreen()));
  final loginText = find.byKey(loginScreenTextKey);
  final emailTextField = find.byKey(emailTextFormKey);
  final passwordTextField = find.byKey(passwordTextFormKey);
  final loginButton = find.byKey(loginButtonKey);

  expect(loginText, findsOneWidget);
  expect(emailTextField, findsOneWidget);
  expect(passwordTextField, findsOneWidget);
  expect(loginButton, findsOneWidget);

});