usb_serial/test/flutter_usb_serial_test.dart

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_usb_serial/flutter_usb_serial.dart';
import 'package:flutter_usb_serial/flutter_usb_serial_method_channel.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('$MethodChannelFlutterUsbSerial can be constructed', () {
    expect(
      MethodChannelFlutterUsbSerial(),
      isA<MethodChannelFlutterUsbSerial>(),
    );
  });

  test('UsbSerialDevice maps fields from method channel payloads', () {
    final device = UsbSerialDevice.fromMap({
      'deviceId': 7,
      'vendorId': 0x1234,
      'productId': 0x5678,
      'deviceName': 'Adapter',
      'manufacturerName': 'Acme',
      'serialNumber': 'SN-42',
    });

    expect(device.deviceId, 7);
    expect(device.vendorId, 0x1234);
    expect(device.productId, 0x5678);
    expect(device.deviceName, 'Adapter');
    expect(device.manufacturerName, 'Acme');
    expect(device.serialNumber, 'SN-42');
    expect(device.toMap()['deviceId'], 7);
  });

  test(
    'isDriverAvailable forwards the native DriverKit readiness result',
    () async {
      const channel = MethodChannel('flutter_usb_serial/methods');
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(channel, (call) async {
            expect(call.method, 'isDriverAvailable');
            return true;
          });
      addTearDown(() {
        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
            .setMockMethodCallHandler(channel, null);
      });

      expect(await FlutterUsbSerial.isDriverAvailable(), isTrue);
    },
  );
}