विजेट परीक्षण के सिद्धांत

import 'package:flutter/material.dart';

class MyTextWidget extends StatelessWidget {
  final String message;

  const MyTextWidget({Key? key, required this.message}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Test')),
        body: Center(
          child: Text(message),
        ),
      ),
    );
  }
}

void main() {
  runApp(const MyTextWidget(message: "Hello CoddyKit!"));
}

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

// Assume MyTextWidget is defined in a separate file or above for testing
class MyTextWidget extends StatelessWidget {
  final String message;
  const MyTextWidget({Key? key, required this.message}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Test')),
        body: Center(
          child: Text(message),
        ),
      ),
    );
  }
}

void main() {
  testWidgets('MyTextWidget displays correct message', (WidgetTester tester) async {
    // Build our widget and trigger a frame.
    await tester.pumpWidget(const MyTextWidget(message: 'Hello CoddyKit!'));

    // Verify that our message appears.
    expect(find.text('Hello CoddyKit!'), findsOneWidget);
    expect(find.text('Goodbye!'), findsNothing);
  });
}

import 'package:flutter/material.dart';

class CounterWidget extends StatefulWidget {
  const CounterWidget({Key? key}) : super(key: key);

  @override
  State<CounterWidget> createState() => _CounterWidgetState();
}

class _CounterWidgetState extends State<CounterWidget> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Counter')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'You have pushed the button this many times:',
              ),
              Text(
                '$_counter',
                key: const Key('counterText'), // Added key for easy finding
                style: Theme.of(context).textTheme.headlineMedium,
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          key: const Key('incrementButton'), // Added key
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: const Icon(Icons.add),
        ),
      ),
    );
  }
}

void main() {
  runApp(const CounterWidget());
}

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

// Assume CounterWidget is defined in a separate file or above for testing
class CounterWidget extends StatefulWidget {
  const CounterWidget({Key? key}) : super(key: key);
  @override
  State<CounterWidget> createState() => _CounterWidgetState();
}
class _CounterWidgetState extends State<CounterWidget> {
  int _counter = 0;
  void _incrementCounter() {
    setState(() { _counter++; });
  }
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Counter')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text('You have pushed the button this many times:'),
              Text('$_counter', key: const Key('counterText'), style: Theme.of(context).textTheme.headlineMedium),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          key: const Key('incrementButton'),
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: const Icon(Icons.add),
        ),
      ),
    );
  }
}

void main() {
  testWidgets('CounterWidget increments counter on button tap', (WidgetTester tester) async {
    // Build our CounterWidget.
    await tester.pumpWidget(const CounterWidget());

    // Verify that the counter starts at 0.
    expect(find.text('0'), findsOneWidget);
    expect(find.text('1'), findsNothing);

    // Tap the 'increment' icon and trigger a frame.
    await tester.tap(find.byKey(const Key('incrementButton')));
    await tester.pump(); // Rebuild the widget after interaction

    // Verify that the counter has incremented.
    expect(find.text('0'), findsNothing);
    expect(find.text('1'), findsOneWidget);
  });
}