printer/test/printer_method_channel_test.dart

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:printer/printer_method_channel.dart';
import 'package:printer/enums/multi_byte_encoding.dart';
import 'package:printer/enums/printer_alignment.dart';
import 'package:printer/enums/serial_flow_control.dart';
import 'package:printer/enums/serial_parity.dart';
import 'package:printer/enums/serial_stop_bits.dart';
import 'package:printer/models/printer_exception.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  MethodChannelPrinter platform = MethodChannelPrinter();
  const MethodChannel channel = MethodChannel('printer');

  setUp(() {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'getPlatformVersion') {
        return '42';
      }
      if (methodCall.method == 'openComPort') {
        return 1;
      }
      if (methodCall.method == 'openUsbPort') {
        return 2;
      }
      if (methodCall.method == 'closePort') {
        return true;
      }
      if (methodCall.method == 'isPortOpened') {
        return true;
      }
      if (methodCall.method == 'enumComPorts') {
        return ['/dev/ttyS0', '/dev/ttyS1'];
      }
      if (methodCall.method == 'enumUsbPorts') {
        return ['USB_Printer_0'];
      }
      if (methodCall.method == 'setMultiByteMode') return true;
      if (methodCall.method == 'setMultiByteEncoding') return true;
      if (methodCall.method == 'printText') return true;
      if (methodCall.method == 'setAlignment') return true;
      if (methodCall.method == 'setTextScale') return true;
      if (methodCall.method == 'setTextBold') return true;
      if (methodCall.method == 'setTextUnderline') return true;
      if (methodCall.method == 'feedLine') return true;
      if (methodCall.method == 'feedDot') return true;
      if (methodCall.method == 'halfCutPaper') return true;
      if (methodCall.method == 'fullCutPaper') return true;
      return null;
    });
  });

  tearDown(() {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, null);
  });

  test('getPlatformVersion', () async {
    expect(await platform.getPlatformVersion(), '42');
  });

  test('openComPort returns handle', () async {
    final handle = await platform.openComPort(
      portName: '/dev/ttyS0',
      baudRate: 115200,
      parity: SerialParity.none,
      stopBits: SerialStopBits.one,
      flowControl: SerialFlowControl.none,
    );

    expect(handle, 1);
  });

  test('openComPort passes correct parameters', () async {
    late Map<dynamic, dynamic> capturedArgs;

    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'openComPort') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return 42;
      }
      return null;
    });

    await platform.openComPort(
      portName: '/dev/ttyS0',
      baudRate: 9600,
      dataBits: 7,
      parity: SerialParity.even,
      stopBits: SerialStopBits.two,
      flowControl: SerialFlowControl.rtsCts,
      autoReplyMode: false,
    );

    expect(capturedArgs['portName'], '/dev/ttyS0');
    expect(capturedArgs['baudRate'], 9600);
    expect(capturedArgs['dataBits'], 7);
    expect(capturedArgs['parity'], 2); // SerialParity.even
    expect(capturedArgs['stopBits'], 2); // SerialStopBits.two
    expect(capturedArgs['flowControl'], 2); // SerialFlowControl.rtsCts
    expect(capturedArgs['autoReplyMode'], 0); // false
  });

  test('openUsbPort returns handle', () async {
    final handle = await platform.openUsbPort(portName: 'USB_Printer_0');

    expect(handle, 2);
  });

  test('closePort returns true', () async {
    final result = await platform.closePort(1);

    expect(result, true);
  });

  test('isPortOpened returns true', () async {
    final result = await platform.isPortOpened(1);

    expect(result, true);
  });

  test('enumComPorts returns list of strings', () async {
    final ports = await platform.enumComPorts();

    expect(ports, isA<List<String>>());
    expect(ports, contains('/dev/ttyS0'));
    expect(ports, contains('/dev/ttyS1'));
  });

  test('enumUsbPorts returns list of strings', () async {
    final ports = await platform.enumUsbPorts();

    expect(ports, isA<List<String>>());
    expect(ports, contains('USB_Printer_0'));
  });

  test('PlatformException converts to PrinterException on openComPort', () async {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'openComPort') {
        throw PlatformException(
          code: 'PORT_OPEN_FAILED',
          message: 'Failed to open port',
          details: {'port': '/dev/ttyS0'},
        );
      }
      return null;
    });

    expect(
      () async => platform.openComPort(
        portName: '/dev/ttyS0',
        baudRate: 115200,
      ),
      throwsA(isA<PrinterException>()
          .having((e) => e.code, 'code', 'PORT_OPEN_FAILED')
          .having((e) => e.message, 'message', 'Failed to open port')),
    );
  });

  test('PlatformException converts to PrinterException on closePort', () async {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'closePort') {
        throw PlatformException(
          code: 'PORT_CLOSE_FAILED',
          message: 'Failed to close port',
        );
      }
      return null;
    });

    expect(
      () async => platform.closePort(1),
      throwsA(isA<PrinterException>()
          .having((e) => e.code, 'code', 'PORT_CLOSE_FAILED')),
    );
  });

  test('printText passes text parameter', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'printText') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.printText(1, 'Hello 中文');
    expect(capturedArgs['handle'], 1);
    expect(capturedArgs['text'], 'Hello 中文');
  });

  test('setAlignment passes alignment.value', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'setAlignment') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.setAlignment(1, PrinterAlignment.center);
    expect(capturedArgs['alignment'], 1); // PrinterAlignment.center.value
  });

  test('setMultiByteEncoding passes encoding.value', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'setMultiByteEncoding') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.setMultiByteEncoding(1, MultiByteEncoding.utf8);
    expect(capturedArgs['encoding'], 1); // MultiByteEncoding.utf8.value
  });

  test('setTextBold converts bool to int 0/1', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'setTextBold') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.setTextBold(1, true);
    expect(capturedArgs['bold'], 1);

    await platform.setTextBold(1, false);
    expect(capturedArgs['bold'], 0);
  });

  test('feedDot passes numDots parameter', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'feedDot') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.feedDot(1, 100);
    expect(capturedArgs['handle'], 1);
    expect(capturedArgs['numDots'], 100);
  });

  test('fullCutPaper passes handle parameter', () async {
    late Map<dynamic, dynamic> capturedArgs;
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'fullCutPaper') {
        capturedArgs = methodCall.arguments as Map<dynamic, dynamic>;
        return true;
      }
      return null;
    });

    await platform.fullCutPaper(1);
    expect(capturedArgs['handle'], 1);
  });

  test('PlatformException converts to PrinterException on printText', () async {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (MethodCall methodCall) async {
      if (methodCall.method == 'printText') {
        throw PlatformException(
          code: 'PRINT_FAILED',
          message: 'Failed to print text',
        );
      }
      return null;
    });

    expect(
      () async => platform.printText(1, 'test'),
      throwsA(isA<PrinterException>()
          .having((e) => e.code, 'code', 'PRINT_FAILED')),
    );
  });
}