samples/context_menus/test/global_selection_page_test.dart

import 'package:context_menus/global_selection_page.dart';
import 'package:context_menus/main.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Gives correct behavior for all values of contextMenuBuilder',
      (tester) async {
    await tester.pumpWidget(const MyApp());

    // Navigate to the GlobalSelectionPage example.
    await tester.dragUntilVisible(
      find.text(GlobalSelectionPage.title),
      find.byType(ListView),
      const Offset(0.0, -100.0),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.text(GlobalSelectionPage.title));
    await tester.pumpAndSettle();
    expect(
      find.descendant(
        of: find.byType(AppBar),
        matching: find.text(GlobalSelectionPage.title),
      ),
      findsOneWidget,
    );

    // Right click on the plain Text widget.
    TestGesture gesture = await tester.startGesture(
      tester.getCenter(find.descendant(
        of: find.byType(ListView),
        matching: find.byType(Text),
      )),
      kind: PointerDeviceKind.mouse,
      buttons: kSecondaryMouseButton,
    );
    await tester.pump();
    await gesture.up();
    await gesture.removePointer();
    await tester.pumpAndSettle();

    // The default context menu is shown with a custom button.
    expect(find.byType(AdaptiveTextSelectionToolbar), findsOneWidget);
    expect(find.text('Back'), findsOneWidget);
  });
}