flutter_localized_example/test/widget_test.dart

gistfile1.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

import 'package:localized_app_example/widgets/my_widget.dart' show MyWidget;

Widget makeTestableWidget({ Widget child }) {
  return MediaQuery(
    data: MediaQueryData(),
    child: MaterialApp(
      localizationsDelegates: [
        LocalizationDelegate(isTest: true),
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      home: child,
    ),
  );
};

void main() {
  testWidgets("Widget", (WidgetTester tester) async{
    await tester.pumpWidget(makeTestableWidget(child: MyWidget()));
    await tester.pumpAndSettle();

    var findByText = find.byType(Text);
    print(findByText.evaluate());
    expect(findByText.evaluate().isEmpty, false);
    expect(find.text('LOADING') findsOneWidget);
  });
}