cpd_2022_zi/test/widget_tests/widget_slider_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';
import 'package:smoke_cess_app/providers/input_provider.dart';
import 'package:smoke_cess_app/widgets/slider.dart';

void main() {
  testWidgets('Slider starts at 50', (WidgetTester tester) async {
    // Create an instance of the InputProvider and add it to the widget tree
    final inputProvider = InputProvider();
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: inputProvider),
        ],
        child: const MaterialApp(
          home: Scaffold(
            body: MySlider(),
          ),
        ),
      ),
    );

    // Verify that the Slider displays 50
    expect(find.text('50'), findsOneWidget);
  });

  testWidgets('Slider puts 51 after Tap on plus in InputProvider',
      (WidgetTester tester) async {
    final inputProvider = InputProvider();
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: inputProvider),
        ],
        child: const MaterialApp(
          home: Scaffold(
            body: MySlider(),
          ),
        ),
      ),
    );

    await tester.tap(find.byIcon(Icons.add_outlined));
    await tester.pump();

    expect(inputProvider.sliderValue, equals(51));
  });

  testWidgets('Slider puts 49 after Tap on subtract in InputProvider',
      (WidgetTester tester) async {
    final inputProvider = InputProvider();
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: inputProvider),
        ],
        child: const MaterialApp(
          home: Scaffold(
            body: MySlider(),
          ),
        ),
      ),
    );

    await tester.tap(find.byIcon(Icons.remove_outlined));
    await tester.pump();

    expect(inputProvider.sliderValue, equals(49));
  });

  testWidgets('Slider doesnt go higher than 100', (WidgetTester tester) async {
    final inputProvider = InputProvider();
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: inputProvider),
        ],
        child: const MaterialApp(
          home: Scaffold(
            body: MySlider(),
          ),
        ),
      ),
    );

    for (int i = 0; i < 100; i++) {
      await tester.tap(find.byIcon(Icons.add_outlined));
      await tester.pump();
    }

    expect(inputProvider.sliderValue, equals(100));
  });

  testWidgets('Slider doesnt go lower than 0', (WidgetTester tester) async {
    final inputProvider = InputProvider();
    await tester.pumpWidget(
      MultiProvider(
        providers: [
          ChangeNotifierProvider.value(value: inputProvider),
        ],
        child: const MaterialApp(
          home: Scaffold(
            body: MySlider(),
          ),
        ),
      ),
    );

    for (int i = 0; i < 100; i++) {
      await tester.tap(find.byIcon(Icons.remove_outlined));
      await tester.pump();
    }

    expect(inputProvider.sliderValue, equals(0));
  });
}