desktop workflow, devices, and test (#26511)

packages/flutter_tools/lib/src/context_runner.dart

@@ -33,9 +33,12 @@ import 'ios/ios_workflow.dart';
 import 'ios/mac.dart';
 import 'ios/simulators.dart';
 import 'ios/xcodeproj.dart';
+import 'linux/linux_workflow.dart';
+import 'macos/macos_workflow.dart';
 import 'run_hot.dart';
 import 'usage.dart';
 import 'version.dart';
+import 'windows/windows_workflow.dart';
 
 Future<T> runInContext<T>(
   FutureOr<T> runner(), {
@@ -75,7 +78,9 @@ Future<T> runInContext<T>(
       IOSWorkflow: () => const IOSWorkflow(),
       IOSValidator: () => const IOSValidator(),
       KernelCompiler: () => const KernelCompiler(),
+      LinuxWorkflow: () => const LinuxWorkflow(),
       Logger: () => platform.isWindows ? WindowsStdoutLogger() : StdoutLogger(),
+      MacOSWorkflow: () => const MacOSWorkflow(),
       OperatingSystemUtils: () => OperatingSystemUtils(),
       PlistBuddy: () => const PlistBuddy(),
       SimControl: () => SimControl(),
@@ -83,6 +88,7 @@ Future<T> runInContext<T>(
       Stdio: () => const Stdio(),
       Usage: () => Usage(),
       UserMessages: () => UserMessages(),
+      WindowsWorkflow: () => const WindowsWorkflow(),
       Xcode: () => Xcode(),
       XcodeProjectInterpreter: () => XcodeProjectInterpreter(),
     },

packages/flutter_tools/lib/src/desktop.dart

@@ -0,0 +1,27 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'base/file_system.dart';
+import 'base/platform.dart';
+import 'cache.dart';
+
+// Only launch or display desktop embedding devices if there is a sibling
+// FDE repository or a `FLUTTER_DESKTOP_EMBEDDING` environment variable which
+// contains a FDE repo.
+bool get hasFlutterDesktopRepository {
+  if (_hasFlutterDesktopRepository == null) {
+    final String desktopLocation = platform.environment['FLUTTER_DESKTOP_EMBEDDING'];
+    if (desktopLocation != null && desktopLocation.isNotEmpty) {
+      _hasFlutterDesktopRepository = fs.directory(desktopLocation)
+        .existsSync();
+    } else {
+      final Directory parent = fs.directory(Cache.flutterRoot).parent;
+      _hasFlutterDesktopRepository = parent
+        .childDirectory('flutter-desktop-embedding')
+        .existsSync();
+    }
+  }
+  return _hasFlutterDesktopRepository;
+}
+bool _hasFlutterDesktopRepository;

packages/flutter_tools/lib/src/device.dart

@@ -16,7 +16,10 @@ import 'fuchsia/fuchsia_device.dart';
 import 'globals.dart';
 import 'ios/devices.dart';
 import 'ios/simulators.dart';
+import 'linux/linux_device.dart';
+import 'macos/macos_device.dart';
 import 'tester/flutter_tester.dart';
+import 'windows/windows_device.dart';
 
 DeviceManager get deviceManager => context[DeviceManager];
 
@@ -31,6 +34,9 @@ class DeviceManager {
     _deviceDiscoverers.add(IOSSimulators());
     _deviceDiscoverers.add(FuchsiaDevices());
     _deviceDiscoverers.add(FlutterTesterDevices());
+    _deviceDiscoverers.add(MacOSDevices());
+    _deviceDiscoverers.add(LinuxDevices());
+    _deviceDiscoverers.add(WindowsDevices());
   }
 
   final List<DeviceDiscovery> _deviceDiscoverers = <DeviceDiscovery>[];
@@ -441,3 +447,31 @@ class DiscoveredApp {
   final String id;
   final int observatoryPort;
 }
+
+// An empty device log reader
+class NoOpDeviceLogReader implements DeviceLogReader {
+  NoOpDeviceLogReader(this.name);
+
+  @override
+  final String name;
+
+  @override
+  int appPid;
+
+  @override
+  Stream<String> get logLines => const Stream<String>.empty();
+}
+
+// A portforwarder which does not support forwarding ports.
+class NoOpDevicePortForwarder implements DevicePortForwarder {
+  const NoOpDevicePortForwarder();
+
+  @override
+  Future<int> forward(int devicePort, {int hostPort}) async => devicePort;
+
+  @override
+  List<ForwardedPort> get forwardedPorts => <ForwardedPort>[];
+
+  @override
+  Future<void> unforward(ForwardedPort forwardedPort) async {}
+}

packages/flutter_tools/lib/src/linux/linux_device.dart

@@ -0,0 +1,101 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../application_package.dart';
+import '../base/os.dart';
+import '../base/platform.dart';
+import '../build_info.dart';
+import '../device.dart';
+import 'linux_workflow.dart';
+
+/// A device that represents a desktop Linux target.
+class LinuxDevice extends Device {
+  LinuxDevice() : super('Linux');
+
+  @override
+  void clearLogs() {}
+
+  @override
+  DeviceLogReader getLogReader({ApplicationPackage app}) => NoOpDeviceLogReader('linux');
+
+  @override
+  Future<bool> installApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isAppInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isLatestBuildInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> get isLocalEmulator async => false;
+
+  @override
+  bool isSupported() => true;
+
+  @override
+  String get name => 'Linux';
+
+  @override
+  DevicePortForwarder get portForwarder => const NoOpDevicePortForwarder();
+
+  @override
+  Future<String> get sdkNameAndVersion async => os.name;
+
+  @override
+  Future<LaunchResult> startApp(ApplicationPackage package, {
+    String mainPath,
+    String route,
+    DebuggingOptions debuggingOptions,
+    Map<String, dynamic> platformArgs,
+    bool prebuiltApplication = false,
+    bool applicationNeedsRebuild = false,
+    bool usesTerminalUi = true,
+    bool ipv6 = false,
+  }) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> stopApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<TargetPlatform> get targetPlatform async => TargetPlatform.linux_x64;
+
+  @override
+  Future<bool> uninstallApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+}
+
+class LinuxDevices extends PollingDeviceDiscovery {
+  LinuxDevices() : super('linux devices');
+
+  @override
+  bool get supportsPlatform => platform.isLinux;
+
+  @override
+  bool get canListAnything => linuxWorkflow.canListDevices;
+
+  @override
+  Future<List<Device>> pollingGetDevices() async {
+    if (!canListAnything) {
+      return const <Device>[];
+    }
+    return <Device>[
+      LinuxDevice()
+    ];
+  }
+
+  @override
+  Future<List<String>> getDiagnostics() async => const <String>[];
+}

packages/flutter_tools/lib/src/linux/linux_workflow.dart

@@ -0,0 +1,31 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../base/context.dart';
+import '../base/platform.dart';
+import '../desktop.dart';
+import '../doctor.dart';
+
+/// The [WindowsWorkflow] instance.
+LinuxWorkflow get linuxWorkflow => context[LinuxWorkflow];
+
+/// The windows-specific implementation of a [Workflow].
+///
+/// This workflow requires the flutter-desktop-embedding as a sibling
+/// repository to the flutter repo.
+class LinuxWorkflow implements Workflow {
+  const LinuxWorkflow();
+
+  @override
+  bool get appliesToHostPlatform => platform.isLinux;
+
+  @override
+  bool get canLaunchDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListEmulators => false;
+}

packages/flutter_tools/lib/src/macos/macos_device.dart

@@ -0,0 +1,101 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../application_package.dart';
+import '../base/os.dart';
+import '../base/platform.dart';
+import '../build_info.dart';
+import '../device.dart';
+import 'macos_workflow.dart';
+
+/// A device that represents a desktop MacOS target.
+class MacOSDevice extends Device {
+  MacOSDevice() : super('MacOS');
+
+  @override
+  void clearLogs() {}
+
+  @override
+  DeviceLogReader getLogReader({ApplicationPackage app}) => NoOpDeviceLogReader('macos');
+
+  @override
+  Future<bool> installApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isAppInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isLatestBuildInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> get isLocalEmulator async => false;
+
+  @override
+  bool isSupported() => true;
+
+  @override
+  String get name => 'MacOS';
+
+  @override
+  DevicePortForwarder get portForwarder => const NoOpDevicePortForwarder();
+
+  @override
+  Future<String> get sdkNameAndVersion async => os.name;
+
+  @override
+  Future<LaunchResult> startApp(ApplicationPackage package, {
+    String mainPath,
+    String route,
+    DebuggingOptions debuggingOptions,
+    Map<String, dynamic> platformArgs,
+    bool prebuiltApplication = false,
+    bool applicationNeedsRebuild = false,
+    bool usesTerminalUi = true,
+    bool ipv6 = false,
+  }) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> stopApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<TargetPlatform> get targetPlatform async => TargetPlatform.darwin_x64;
+
+  @override
+  Future<bool> uninstallApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+}
+
+class MacOSDevices extends PollingDeviceDiscovery {
+  MacOSDevices() : super('macos devices');
+
+  @override
+  bool get supportsPlatform => platform.isMacOS;
+
+  @override
+  bool get canListAnything => macOSWorkflow.canListDevices;
+
+  @override
+  Future<List<Device>> pollingGetDevices() async {
+    if (!canListAnything) {
+      return const <Device>[];
+    }
+    return <Device>[
+      MacOSDevice()
+    ];
+  }
+
+  @override
+  Future<List<String>> getDiagnostics() async => const <String>[];
+}

packages/flutter_tools/lib/src/macos/macos_workflow.dart

@@ -0,0 +1,31 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../base/context.dart';
+import '../base/platform.dart';
+import '../desktop.dart';
+import '../doctor.dart';
+
+/// The [MacOSWorkflow] instance.
+MacOSWorkflow get macOSWorkflow => context[MacOSWorkflow];
+
+/// The macos-specific implementation of a [Workflow].
+///
+/// This workflow requires the flutter-desktop-embedding as a sibling
+/// repository to the flutter repo.
+class MacOSWorkflow implements Workflow {
+  const MacOSWorkflow();
+
+  @override
+  bool get appliesToHostPlatform => platform.isMacOS;
+
+  @override
+  bool get canLaunchDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListEmulators => false;
+}

packages/flutter_tools/lib/src/windows/windows_device.dart

@@ -0,0 +1,101 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../application_package.dart';
+import '../base/os.dart';
+import '../base/platform.dart';
+import '../build_info.dart';
+import '../device.dart';
+import 'windows_workflow.dart';
+
+/// A device that represents a desktop Windows target.
+class WindowsDevice extends Device {
+  WindowsDevice() : super('Windows');
+
+  @override
+  void clearLogs() {}
+
+  @override
+  DeviceLogReader getLogReader({ApplicationPackage app}) => NoOpDeviceLogReader('windows');
+
+  @override
+  Future<bool> installApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isAppInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> isLatestBuildInstalled(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> get isLocalEmulator async => false;
+
+  @override
+  bool isSupported() => true;
+
+  @override
+  String get name => 'Windows';
+
+  @override
+  DevicePortForwarder get portForwarder => const NoOpDevicePortForwarder();
+
+  @override
+  Future<String> get sdkNameAndVersion async => os.name;
+
+  @override
+  Future<LaunchResult> startApp(ApplicationPackage package, {
+    String mainPath,
+    String route,
+    DebuggingOptions debuggingOptions,
+    Map<String, dynamic> platformArgs,
+    bool prebuiltApplication = false,
+    bool applicationNeedsRebuild = false,
+    bool usesTerminalUi = true,
+    bool ipv6 = false,
+  }) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<bool> stopApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+
+  @override
+  Future<TargetPlatform> get targetPlatform async => TargetPlatform.windows_x64;
+
+  @override
+  Future<bool> uninstallApp(ApplicationPackage app) {
+    throw UnimplementedError();
+  }
+}
+
+class WindowsDevices extends PollingDeviceDiscovery {
+  WindowsDevices() : super('windows devices');
+
+  @override
+  bool get supportsPlatform => platform.isWindows;
+
+  @override
+  bool get canListAnything => windowsWorkflow.canListDevices;
+
+  @override
+  Future<List<Device>> pollingGetDevices() async {
+    if (!canListAnything) {
+      return const <Device>[];
+    }
+    return <Device>[
+      WindowsDevice()
+    ];
+  }
+
+  @override
+  Future<List<String>> getDiagnostics() async => const <String>[];
+}

packages/flutter_tools/lib/src/windows/windows_workflow.dart

@@ -0,0 +1,31 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../base/context.dart';
+import '../base/platform.dart';
+import '../desktop.dart';
+import '../doctor.dart';
+
+/// The [WindowsWorkflow] instance.
+WindowsWorkflow get windowsWorkflow => context[WindowsWorkflow];
+
+/// The windows-specific implementation of a [Workflow].
+///
+/// This workflow requires the flutter-desktop-embedding as a sibling
+/// repository to the flutter repo.
+class WindowsWorkflow implements Workflow {
+  const WindowsWorkflow();
+
+  @override
+  bool get appliesToHostPlatform => platform.isWindows;
+
+  @override
+  bool get canLaunchDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListDevices => hasFlutterDesktopRepository;
+
+  @override
+  bool get canListEmulators => false;
+}

packages/flutter_tools/test/linux/linux_device_test.dart

@@ -0,0 +1,51 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/build_info.dart';
+import 'package:flutter_tools/src/linux/linux_device.dart';
+import 'package:flutter_tools/src/device.dart';
+import 'package:mockito/mockito.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(LinuxDevice, () {
+    final LinuxDevice device = LinuxDevice();
+    final MockPlatform notLinux = MockPlatform();
+    when(notLinux.isLinux).thenReturn(false);
+    when(notLinux.environment).thenReturn(const <String, String>{});
+
+    test('defaults', () async {
+      expect(await device.targetPlatform, TargetPlatform.linux_x64);
+      expect(device.name, 'Linux');
+    });
+
+    test('unimplemented methods', () {
+      expect(() => device.installApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.uninstallApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isLatestBuildInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.startApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.stopApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isAppInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+    });
+
+    test('noop port forwarding', () async {
+      final LinuxDevice device = LinuxDevice();
+      final DevicePortForwarder portForwarder = device.portForwarder;
+      final int result = await portForwarder.forward(2);
+      expect(result, 2);
+      expect(portForwarder.forwardedPorts.isEmpty, true);
+    });
+
+    testUsingContext('No devices listed if platform unsupported', () async {
+      expect(await LinuxDevices().devices, <Device>[]);
+    }, overrides: <Type, Generator>{
+      Platform: () => notLinux,
+    });
+  });
+}
+
+class MockPlatform extends Mock implements Platform {}

packages/flutter_tools/test/linux/linux_workflow_test.dart

@@ -0,0 +1,58 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:mockito/mockito.dart';
+import 'package:flutter_tools/src/linux/linux_workflow.dart';
+import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/cache.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(LinuxWorkflow, () {
+    final MockPlatform linux = MockPlatform();
+    final MockPlatform notLinux = MockPlatform();
+    when(linux.isLinux).thenReturn(true);
+    when(notLinux.isLinux).thenReturn(false);
+
+    testUsingContext('Applies to linux platform', () {
+      expect(linuxWorkflow.appliesToHostPlatform, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => linux,
+    });
+    testUsingContext('Does not apply to non-linux platform', () {
+      expect(linuxWorkflow.appliesToHostPlatform, false);
+    }, overrides: <Type, Generator>{
+      Platform: () => notLinux,
+    });
+
+    final MockFileSystem fileSystem = MockFileSystem();
+    final MockDirectory directory = MockDirectory();
+    Cache.flutterRoot = '';
+    when(fileSystem.directory(Cache.flutterRoot)).thenReturn(directory);
+    when(directory.parent).thenReturn(directory);
+    when(directory.childDirectory('flutter-desktop-embedding')).thenReturn(directory);
+    when(directory.existsSync()).thenReturn(true);
+
+    testUsingContext('defaults', () {
+      expect(linuxWorkflow.canListEmulators, false);
+      expect(linuxWorkflow.canLaunchDevices, true);
+      expect(linuxWorkflow.canListDevices, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => linux,
+      FileSystem: () => fileSystem,
+    });
+  });
+}
+
+class MockFileSystem extends Mock implements FileSystem {}
+
+class MockDirectory extends Mock implements Directory {}
+
+class MockPlatform extends Mock implements Platform {
+  @override
+  Map<String, String> get environment => const <String, String>{};
+}

packages/flutter_tools/test/macos/macos_device_test.dart

@@ -0,0 +1,51 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/build_info.dart';
+import 'package:flutter_tools/src/device.dart';
+import 'package:flutter_tools/src/macos/macos_device.dart';
+import 'package:mockito/mockito.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(MacOSDevice, () {
+    final MockPlatform notMac = MockPlatform();
+    final MacOSDevice device = MacOSDevice();
+    when(notMac.isMacOS).thenReturn(false);
+    when(notMac.environment).thenReturn(const <String, String>{});
+
+    test('defaults', () async {
+      expect(await device.targetPlatform, TargetPlatform.darwin_x64);
+      expect(device.name, 'MacOS');
+    });
+
+    test('unimplemented methods', () {
+      expect(() => device.installApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.uninstallApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isLatestBuildInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.startApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.stopApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isAppInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+    });
+
+    test('noop port forwarding', () async {
+      final MacOSDevice device = MacOSDevice();
+      final DevicePortForwarder portForwarder = device.portForwarder;
+      final int result = await portForwarder.forward(2);
+      expect(result, 2);
+      expect(portForwarder.forwardedPorts.isEmpty, true);
+    });
+
+    testUsingContext('No devices listed if platform unsupported', () async {
+      expect(await MacOSDevices().devices, <Device>[]);
+    }, overrides: <Type, Generator>{
+      Platform: () => notMac,
+    });
+  });
+}
+
+class MockPlatform extends Mock implements Platform {}

packages/flutter_tools/test/macos/macos_workflow_test.dart

@@ -0,0 +1,59 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:mockito/mockito.dart';
+
+import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/cache.dart';
+import 'package:flutter_tools/src/macos/macos_workflow.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(MacOSWorkflow, () {
+    final MockPlatform mac = MockPlatform();
+    final MockPlatform notMac = MockPlatform();
+    when(mac.isMacOS).thenReturn(true);
+    when(notMac.isMacOS).thenReturn(false);
+
+    testUsingContext('Applies to mac platform', () {
+      expect(macOSWorkflow.appliesToHostPlatform, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => mac,
+    });
+    testUsingContext('Does not apply to non-mac platform', () {
+      expect(macOSWorkflow.appliesToHostPlatform, false);
+    }, overrides: <Type, Generator>{
+      Platform: () => notMac,
+    });
+
+    final MockFileSystem fileSystem = MockFileSystem();
+    final MockDirectory directory = MockDirectory();
+    Cache.flutterRoot = '';
+    when(fileSystem.directory(Cache.flutterRoot)).thenReturn(directory);
+    when(directory.parent).thenReturn(directory);
+    when(directory.childDirectory('flutter-desktop-embedding')).thenReturn(directory);
+    when(directory.existsSync()).thenReturn(true);
+
+    testUsingContext('defaults', () {
+      expect(macOSWorkflow.canListEmulators, false);
+      expect(macOSWorkflow.canLaunchDevices, true);
+      expect(macOSWorkflow.canListDevices, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => mac,
+      FileSystem: () => fileSystem,
+    });
+  });
+}
+
+class MockFileSystem extends Mock implements FileSystem {}
+
+class MockDirectory extends Mock implements Directory {}
+
+class MockPlatform extends Mock implements Platform {
+  @override
+  Map<String, String> get environment => const <String, String>{};
+}

packages/flutter_tools/test/windows/windows_device_test.dart

@@ -0,0 +1,51 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/build_info.dart';
+import 'package:flutter_tools/src/windows/windows_device.dart';
+import 'package:flutter_tools/src/device.dart';
+import 'package:mockito/mockito.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(WindowsDevice, () {
+    final WindowsDevice device = WindowsDevice();
+    final MockPlatform notWindows = MockPlatform();
+    when(notWindows.isWindows).thenReturn(false);
+    when(notWindows.environment).thenReturn(const <String, String>{});
+
+    test('defaults', () async {
+      expect(await device.targetPlatform, TargetPlatform.windows_x64);
+      expect(device.name, 'Windows');
+    });
+
+    test('unimplemented methods', () {
+      expect(() => device.installApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.uninstallApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isLatestBuildInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.startApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.stopApp(null), throwsA(isInstanceOf<UnimplementedError>()));
+      expect(() => device.isAppInstalled(null), throwsA(isInstanceOf<UnimplementedError>()));
+    });
+
+    test('noop port forwarding', () async {
+      final WindowsDevice device = WindowsDevice();
+      final DevicePortForwarder portForwarder = device.portForwarder;
+      final int result = await portForwarder.forward(2);
+      expect(result, 2);
+      expect(portForwarder.forwardedPorts.isEmpty, true);
+    });
+
+    testUsingContext('No devices listed if platform unsupported', () async {
+      expect(await WindowsDevices().devices, <Device>[]);
+    }, overrides: <Type, Generator>{
+      Platform: () => notWindows,
+    });
+  });
+}
+
+class MockPlatform extends Mock implements Platform {}

packages/flutter_tools/test/windows/windows_workflow_test.dart

@@ -0,0 +1,59 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:mockito/mockito.dart';
+
+import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/platform.dart';
+import 'package:flutter_tools/src/cache.dart';
+import 'package:flutter_tools/src/windows/windows_workflow.dart';
+
+import '../src/common.dart';
+import '../src/context.dart';
+
+void main() {
+  group(WindowsWorkflow, () {
+    final MockPlatform windows = MockPlatform();
+    final MockPlatform notWindows = MockPlatform();
+    when(windows.isWindows).thenReturn(true);
+    when(notWindows.isWindows).thenReturn(false);
+
+    testUsingContext('Applies to windows platform', () {
+      expect(windowsWorkflow.appliesToHostPlatform, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => windows,
+    });
+    testUsingContext('Does not apply to non-windows platform', () {
+      expect(windowsWorkflow.appliesToHostPlatform, false);
+    }, overrides: <Type, Generator>{
+      Platform: () => notWindows,
+    });
+
+    final MockFileSystem fileSystem = MockFileSystem();
+    final MockDirectory directory = MockDirectory();
+    Cache.flutterRoot = '';
+    when(fileSystem.directory(Cache.flutterRoot)).thenReturn(directory);
+    when(directory.parent).thenReturn(directory);
+    when(directory.childDirectory('flutter-desktop-embedding')).thenReturn(directory);
+    when(directory.existsSync()).thenReturn(true);
+
+    testUsingContext('defaults', () {
+      expect(windowsWorkflow.canListEmulators, false);
+      expect(windowsWorkflow.canLaunchDevices, true);
+      expect(windowsWorkflow.canListDevices, true);
+    }, overrides: <Type, Generator>{
+      Platform: () => windows,
+      FileSystem: () => fileSystem,
+    });
+  });
+}
+
+class MockFileSystem extends Mock implements FileSystem {}
+
+class MockDirectory extends Mock implements Directory {}
+
+class MockPlatform extends Mock implements Platform {
+  @override
+  Map<String, String> get environment => const <String, String>{};
+}