User view test - Unit testing Flutter GraphQL

user_view_test.dart

void main() {
  late MockGraphQLClient mockGraphQLClient;

  setUp(() {
    mockGraphQLClient = generateMockGraphQLClient();
  });

  Widget _buildTestScaffold() {
    return GraphQLProvider(
        client: ValueNotifier(mockGraphQLClient),
        child: MaterialApp(
          home: Material(
          child: UserView(_userId),
        ),
      ),
    );
  }

  group('Profile', () {
    testWidgets('displays a loading indicator when query is loading',
        (tester) async {
      final result = generateMockWatchQuery<Query$UserById>(mockGraphQLClient);
      when(() => result.isLoading).thenReturn(true);

      await tester.pumpWidget(_buildTestScaffold());

      expect(find.byType(CircularProgressIndicator), findsOneWidget);
    });

    testWidgets('renders a message on error', (tester) async {
      final result = generateMockWatchQuery<Query$UserById>(mockGraphQLClient);
      when(() => result.isLoading).thenReturn(false);
      when(() => result.hasException).thenReturn(true);

      await tester.pumpWidget(_buildTestScaffold());

      expect(
          find.text('There was an issue loading your profile'), findsOneWidget);
    });

    testWidgets('renders the appropriate elements', (tester) async {
      final result = generateMockWatchQuery<Query$UserById>(mockGraphQLClient);
      when(() => result.isLoading).thenReturn(false);
      when(() => result.hasException).thenReturn(false);
      when(() => result.parsedData).thenReturn(
        Query$UserById(
          getUser: Query$UserById$getUser(
            xid: _userId,
            email: _email,
            displayName: _displayName,
            $__typename: 'user',
          ),
          $__typename: 'getUser',
        ),
      );

      await tester.pumpWidget(_buildTestScaffold());

      expect(find.text(_displayName), findsOneWidget);
      expect(find.text(_email), findsOneWidget);
    });
  });
}

const _displayName = 'First Last';
const _email = '[email protected]';
const _userId = '123';