CPD/Pong/test/widget_test.dart

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

import 'package:pong/main.dart';

void main() {
  // Widget test for the "Berühren um zu beginnen!" message
  testWidgets('Tests "Berühren um zu beginnen!"', (WidgetTester tester) async {
    final tapToStart = find.text("Berühren um zu beginnen!");

    // Build the widget tree with StartScreen and pump the widget tree
    await tester.pumpWidget(const MaterialApp(home: StartScreen()));

    // Verify that the "Berühren um zu beginnen!" text is displayed
    expect(tapToStart, findsOneWidget);
  });

  // Widget test for the "Punkte:" message in GameScreen
  testWidgets('Tests "Punkte:"', (WidgetTester tester) async {
    final points = find.text("Punkte: 0");

    // Build the widget tree with GameScreen and pump the widget tree
    await tester.pumpWidget(const MaterialApp(home: GameScreen()));

    // Verify that the "Punkte: 0" text is displayed
    expect(points, findsOneWidget);
  });

  // Widget test for the UI of StartScreen
  testWidgets('StartScreen UI Test', (WidgetTester tester) async {
    // Build our app and trigger a frame.
    await tester.pumpWidget(const MaterialApp(
      home: StartScreen(),
    ));

    // Verify that the "Berühren um zu beginnen!" Text is displayed.
    expect(find.text('Berühren um zu beginnen!'), findsOneWidget);

    // Tap on the GestureDetector to navigate to GameScreen.
    await tester.tap(find.byType(GestureDetector));
    await tester.pump();

    // Verify that the transition to GameScreen has occurred.
    expect(find.byType(GameScreen), findsOneWidget);
  });
}