cashumit/test/bluetooth_service_test.dart

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:cashumit/services/bluetooth_service.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('BluetoothService Tests', () {
    late BluetoothService bluetoothService;

    setUp(() {
      SharedPreferences.setMockInitialValues({});
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(
        const MethodChannel('bluetooth_print/methods'),
        (MethodCall methodCall) async {
          switch (methodCall.method) {
            case 'state':
              return 12; // STATE_ON
            case 'startScan':
              return null;
            case 'stopScan':
              return null;
            case 'isConnected':
              return false;
            default:
              return null;
          }
        },
      );

      bluetoothService = BluetoothService();
    });

    tearDown(() {
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(
        const MethodChannel('bluetooth_print/methods'),
        null,
      );
    });

    test('initial values and getters work properly', () {
      expect(bluetoothService.isConnected, false);
      expect(bluetoothService.isPrinting, false);
      expect(bluetoothService.connectedDevice, isNull);
      expect(bluetoothService.isScanningNow, false);
    });

    test('stopScan executes gracefully', () async {
      await bluetoothService.stopScan();
      expect(bluetoothService.isScanningNow, false);
    });

    test('reconnectIfNeeded returns false when no saved device', () async {
      final result = await bluetoothService.reconnectIfNeeded();
      expect(result, false);
    });
  });
}