halkyon/packages/halkyon_ui/test/widget/help_button_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:material_ui/material_ui.dart';

import '../support/test_app.dart';

void main() {
  testWidgets('the explanation stays hidden until the question mark is '
      'tapped, then shows under its title and closes again', (tester) async {
    await tester.pumpWidget(
      testApp(
        const Scaffold(
          body: HelpButton('How sources are cited.', title: 'Citation style'),
        ),
      ),
    );
    expect(find.text('How sources are cited.'), findsNothing);
    expect(find.byTooltip("What's this?"), findsOneWidget);

    await tester.tap(find.byType(HelpButton));
    await tester.pumpAndSettle();
    expect(find.text('Citation style'), findsOneWidget);
    expect(find.text('How sources are cited.'), findsOneWidget);

    await tester.tap(find.text('OK'));
    await tester.pumpAndSettle();
    expect(find.text('How sources are cited.'), findsNothing);
  });
  testWidgets('an action offered stands beside OK', (tester) async {
    var read = false;
    await tester.pumpWidget(
      testApp(
        Scaffold(
          body: HelpButton(
            'Map by OpenFreeMap.',
            action: (label: 'What it keeps', onPressed: () => read = true),
          ),
        ),
      ),
    );
    await tester.tap(find.byType(HelpButton));
    await tester.pumpAndSettle();
    await tester.tap(find.text('What it keeps'));
    expect(read, isTrue);
    expect(find.text('OK'), findsOneWidget);
  });
}