CPD/test/widget_test.dart

// This is a basic Flutter widget test.
//
// To perform an interaction with a widget in your test, use the WidgetTester
// utility in the flutter_test package. For example, you can send tap and scroll
// gestures. You can also use WidgetTester to find child widgets in the widget
// tree, read text, and verify that the values of widget properties are correct.

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


void main() {
  testWidgets('Kalorienverbrauch Rechner - Valid Input', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());

    // Find text fields and button
    final gewichtField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Gewicht (in kg)');
    final streckeField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Strecke (in km)');
    final zeitField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Zeit (in Minuten)');
    final berechnenButton = find.byType(ElevatedButton);

    // Enter valid input
    await tester.enterText(gewichtField, '70');
    await tester.enterText(streckeField, '10');
    await tester.enterText(zeitField, '60');

    // Tap the calculate button
    await tester.tap(berechnenButton);

    // Rebuild the widget after the state has changed
    await tester.pump();

    // Verify that the calculation is correct
    expect(find.text('Geschwindigkeit pro Kilometer: 6.00 Minuten'), findsOneWidget);
    expect(find.text('Kalorienverbrauch: 700.00 kcal'), findsOneWidget);
  });

  testWidgets('Kalorienverbrauch Rechner - Invalid Input', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());

    // Find text fields and button
    final gewichtField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Gewicht (in kg)');
    final streckeField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Strecke (in km)');
    final zeitField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Zeit (in Minuten)');
    final berechnenButton = find.byType(ElevatedButton);

    // Enter invalid input
    await tester.enterText(gewichtField, '70');
    await tester.enterText(streckeField, '10');
    await tester.enterText(zeitField, '30'); // Invalid speed

    // Tap the calculate button
    await tester.tap(berechnenButton);

    // Rebuild the widget after the state has changed
    await tester.pump();

    // Verify that the error message is displayed
    expect(find.text('Ungültige Angaben'), findsOneWidget);
  });

  testWidgets('Kalorienverbrauch Rechner - Edge Case Input', (WidgetTester tester) async {
    await tester.pumpWidget(MyApp());

    // Find text fields and button
    final gewichtField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Gewicht (in kg)');
    final streckeField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Strecke (in km)');
    final zeitField = find.byWidgetPredicate((widget) => widget is TextField && widget.decoration?.labelText == 'Zeit (in Minuten)');
    final berechnenButton = find.byType(ElevatedButton);

    // Enter edge case input (speed = 15 km/h)
    await tester.enterText(gewichtField, '70');
    await tester.enterText(streckeField, '15');
    await tester.enterText(zeitField, '60');

    // Tap the calculate button
    await tester.tap(berechnenButton);

    // Rebuild the widget after the state has changed
    await tester.pump();

    // Debug output
    print(tester.widgetList(find.text('Geschwindigkeit pro Kilometer:')).toList());
    print(tester.widgetList(find.text('Kalorienverbrauch:')).toList());

    // Verify that the calculation is correct
    expect(find.text('Geschwindigkeit pro Kilometer: 4.00 Minuten'), findsOneWidget);
    expect(find.text('Kalorienverbrauch: 840.00 kcal'), findsOneWidget);
  });
}