Unable to Widget test localized widgets

[martin-robert-fink]

Whenever I try to tester.pumpWidget(myWidget), if myWidget has any calls to S.of(context), then the widget testing fails as a call to NULL. Is there a proper way to do widget testing using Flutter Intl to resolve the context and get the widget tests to work? If there is, perhaps add a short paragraph on widget testing in the docs. Thx.

[martin-robert-fink]

Shortly after posting this, I figured it out on my own. I'll document the solution here in case in helps others:

Essentially, it's a simple mechanism to replicate the localization setup in the Material app when testing the widget, like this:

file: widget_test.dart

import 'package:flutter_localizations/flutter_localizations.dart';
import '../lib/generated/S.dart';

void main() {
  testWidgets('Test Localized Widget', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        localizationsDelegates: [
          S.delegate,
          GlobalMaterialLocalizations.delegate,
          GlobalWidgetsLocalizations.delegate,
          GlobalCupertinoLocalizations.delegate,
        ],
        supportedLocales: S.delegate.supportedLocales,
        home: LocalizedWidgetToTest(), // Whatever widget needs testing
      ),
    );

    await tester.pumpAndSettle(); // Wait for localization delegates to complete

    // Whatever you expect to find
    expect(find.byType(TextField), findsOneWidget());
  });
}

[aleksakrstic]

@martin-robert-fink You can also check out tests in Sample app: https://github.com/localizely/flutter-intl-plugin-sample-app/blob/master/test/localized_widget_test.dart