[fuchsia] Add support for the 'device' command using the SDK (#31910)

bin/internal/fuchsia.version

@@ -1 +1 @@
-Ow5Xdviq7OwKr7XNuf-Bw0nBMeAr849mFn7gc_RUpzUC
+mfXzGfxNWcf6BHsv083b56vQcj96yCo0exBFBdjE4gMC

packages/flutter_tools/lib/src/context_runner.dart

@@ -72,7 +72,7 @@ Future<T> runInContext<T>(
       DoctorValidatorsProvider: () => DoctorValidatorsProvider.defaultInstance,
       EmulatorManager: () => EmulatorManager(),
       FuchsiaSdk: () => FuchsiaSdk(),
-      FuchsiaArtifacts: () => FuchsiaArtifacts(),
+      FuchsiaArtifacts: () => FuchsiaArtifacts.find(),
       FuchsiaWorkflow: () => FuchsiaWorkflow(),
       Flags: () => const EmptyFlags(),
       FlutterVersion: () => FlutterVersion(const SystemClock()),

packages/flutter_tools/lib/src/fuchsia/fuchsia_device.dart

@@ -35,7 +35,8 @@ Future<VMService> _kDefaultFuchsiaIsolateDiscoveryConnector(Uri uri) {
 class _FuchsiaLogReader extends DeviceLogReader {
   _FuchsiaLogReader(this._device, [this._app]);
 
-  static final RegExp _flutterLogOutput = RegExp(r'INFO: \w+\(flutter\): ');
+  // \S matches non-whitespace characters.
+  static final RegExp _flutterLogOutput = RegExp(r'INFO: \S+\(flutter\): ');
 
   FuchsiaDevice _device;
   ApplicationPackage _app;
@@ -46,7 +47,7 @@ class _FuchsiaLogReader extends DeviceLogReader {
   Stream<String> _logLines;
   @override
   Stream<String> get logLines {
-    _logLines ??= _processLogs(fuchsiaSdk.syslogs());
+    _logLines ??= _processLogs(fuchsiaSdk.syslogs(_device.id));
     return _logLines;
   }
 
@@ -57,8 +58,8 @@ class _FuchsiaLogReader extends DeviceLogReader {
     // Determine if line comes from flutter, and optionally whether it matches
     // the correct fuchsia module.
     final RegExp matchRegExp = _app == null
-      ? _flutterLogOutput
+        ? _flutterLogOutput
-      : RegExp('INFO: ${_app.name}\\(flutter\\): ');
+        : RegExp('INFO: ${_app.name}\\(flutter\\): ');
     return Stream<String>.eventTransformed(
       lines,
       (Sink<String> outout) => _FuchsiaLogSink(outout, matchRegExp, startTime),
@@ -90,16 +91,19 @@ class _FuchsiaLogSink implements EventSink<String> {
     if (logTime.millisecondsSinceEpoch < _startTime.millisecondsSinceEpoch) {
       return;
     }
-    _outputSink.add('[${logTime.toLocal()}] Flutter: ${line.split(_matchRegExp).last}');
+    _outputSink.add(
+        '[${logTime.toLocal()}] Flutter: ${line.split(_matchRegExp).last}');
   }
 
   @override
-  void addError(Object error, [ StackTrace stackTrace ]) {
+  void addError(Object error, [StackTrace stackTrace]) {
     _outputSink.addError(error, stackTrace);
   }
 
   @override
-  void close() { _outputSink.close(); }
+  void close() {
+    _outputSink.close();
+  }
 }
 
 class FuchsiaDevices extends PollingDeviceDiscovery {
@@ -146,7 +150,7 @@ List<FuchsiaDevice> parseListDevices(String text) {
 }
 
 class FuchsiaDevice extends Device {
-  FuchsiaDevice(String id, { this.name }) : super(id);
+  FuchsiaDevice(String id, {this.name}) : super(id);
 
   @override
   bool get supportsHotReload => true;
@@ -191,7 +195,8 @@ class FuchsiaDevice extends Device {
     bool prebuiltApplication = false,
     bool usesTerminalUi = true,
     bool ipv6 = false,
-  }) => Future<void>.error('unimplemented');
+  }) =>
+      Future<void>.error('unimplemented');
 
   @override
   Future<bool> stopApp(ApplicationPackage app) async {
@@ -206,15 +211,17 @@ class FuchsiaDevice extends Device {
   Future<String> get sdkNameAndVersion async => 'Fuchsia';
 
   @override
-  DeviceLogReader getLogReader({ ApplicationPackage app }) => _logReader ??= _FuchsiaLogReader(this, app);
+  DeviceLogReader getLogReader({ApplicationPackage app}) =>
+      _logReader ??= _FuchsiaLogReader(this, app);
   _FuchsiaLogReader _logReader;
 
   @override
-  DevicePortForwarder get portForwarder => _portForwarder ??= _FuchsiaPortForwarder(this);
+  DevicePortForwarder get portForwarder =>
+      _portForwarder ??= _FuchsiaPortForwarder(this);
   _FuchsiaPortForwarder _portForwarder;
 
   @override
-  void clearLogs() { }
+  void clearLogs() {}
 
   @override
   bool get supportsScreenshot => false;
@@ -234,7 +241,8 @@ class FuchsiaDevice extends Device {
   Future<List<int>> servicePorts() async {
     final String findOutput = await shell('find /hub -name vmservice-port');
     if (findOutput.trim() == '') {
-      throwToolExit('No Dart Observatories found. Are you running a debug build?');
+      throwToolExit(
+          'No Dart Observatories found. Are you running a debug build?');
       return null;
     }
     final List<int> ports = <int>[];
@@ -259,9 +267,15 @@ class FuchsiaDevice extends Device {
   /// Run `command` on the Fuchsia device shell.
   Future<String> shell(String command) async {
     final RunResult result = await runAsync(<String>[
-      'ssh', '-F', fuchsiaArtifacts.sshConfig.absolute.path, id, command]);
+      'ssh',
+      '-F',
+      fuchsiaArtifacts.sshConfig.absolute.path,
+      id,
+      command
+    ]);
     if (result.exitCode != 0) {
-      throwToolExit('Command failed: $command\nstdout: ${result.stdout}\nstderr: ${result.stderr}');
+      throwToolExit(
+          'Command failed: $command\nstdout: ${result.stdout}\nstderr: ${result.stderr}');
       return null;
     }
     return result.stdout;
@@ -302,7 +316,9 @@ class FuchsiaDevice extends Device {
     return null;
   }
 
-  FuchsiaIsolateDiscoveryProtocol  getIsolateDiscoveryProtocol(String isolateName) => FuchsiaIsolateDiscoveryProtocol(this, isolateName);
+  FuchsiaIsolateDiscoveryProtocol getIsolateDiscoveryProtocol(
+          String isolateName) =>
+      FuchsiaIsolateDiscoveryProtocol(this, isolateName);
 
   @override
   bool isSupportedForProject(FlutterProject flutterProject) => true;
@@ -341,6 +357,7 @@ class FuchsiaIsolateDiscoveryProtocol {
       return uri;
     });
   }
+
   Uri _uri;
 
   void dispose() {
@@ -379,8 +396,8 @@ class FuchsiaIsolateDiscoveryProtocol {
         final Uri address = flutterView.owner.vmService.httpAddress;
         if (flutterView.uiIsolate.name.contains(_isolateName)) {
           _foundUri.complete(_device.ipv6
-            ? Uri.parse('http://[$_ipv6Loopback]:${address.port}/')
+              ? Uri.parse('http://[$_ipv6Loopback]:${address.port}/')
-            : Uri.parse('http://$_ipv4Loopback:${address.port}/'));
+              : Uri.parse('http://$_ipv4Loopback:${address.port}/'));
           _status.stop();
           return;
         }
@@ -402,13 +419,22 @@ class _FuchsiaPortForwarder extends DevicePortForwarder {
   final Map<int, Process> _processes = <int, Process>{};
 
   @override
-  Future<int> forward(int devicePort, { int hostPort }) async {
+  Future<int> forward(int devicePort, {int hostPort}) async {
     hostPort ??= await _findPort();
     // Note: the provided command works around a bug in -N, see US-515
     // for more explanation.
     final List<String> command = <String>[
-      'ssh', '-6', '-F', fuchsiaArtifacts.sshConfig.absolute.path, '-nNT', '-vvv', '-f',
+      'ssh',
-      '-L', '$hostPort:$_ipv4Loopback:$devicePort', device.id, 'true',
+      '-6',
+      '-F',
+      fuchsiaArtifacts.sshConfig.absolute.path,
+      '-nNT',
+      '-vvv',
+      '-f',
+      '-L',
+      '$hostPort:$_ipv4Loopback:$devicePort',
+      device.id,
+      'true',
     ];
     final Process process = await processManager.start(command);
     unawaited(process.exitCode.then((int exitCode) {
@@ -431,8 +457,16 @@ class _FuchsiaPortForwarder extends DevicePortForwarder {
     final Process process = _processes.remove(forwardedPort.hostPort);
     process?.kill();
     final List<String> command = <String>[
-        'ssh', '-F', fuchsiaArtifacts.sshConfig.absolute.path, '-O', 'cancel', '-vvv',
+      'ssh',
-        '-L', '${forwardedPort.hostPort}:$_ipv4Loopback:${forwardedPort.devicePort}', device.id];
+      '-F',
+      fuchsiaArtifacts.sshConfig.absolute.path,
+      '-O',
+      'cancel',
+      '-vvv',
+      '-L',
+      '${forwardedPort.hostPort}:$_ipv4Loopback:${forwardedPort.devicePort}',
+      device.id
+    ];
     final ProcessResult result = await processManager.run(command);
     if (result.exitCode != 0) {
       throwToolExit(result.stderr);
@@ -449,8 +483,9 @@ class _FuchsiaPortForwarder extends DevicePortForwarder {
       // Failures are signaled by a return value of 0 from this function.
       printTrace('_findPort failed: $e');
     }
-    if (serverSocket != null)
+    if (serverSocket != null) {
       await serverSocket.close();
+    }
     return port;
   }
 }

packages/flutter_tools/lib/src/fuchsia/fuchsia_sdk.dart

@@ -7,8 +7,10 @@ import 'dart:async';
 import '../base/context.dart';
 import '../base/file_system.dart';
 import '../base/io.dart';
+import '../base/platform.dart';
 import '../base/process.dart';
 import '../base/process_manager.dart';
+import '../cache.dart';
 import '../convert.dart';
 import '../globals.dart';
 
@@ -23,8 +25,6 @@ FuchsiaArtifacts get fuchsiaArtifacts => context.get<FuchsiaArtifacts>();
 /// This workflow assumes development within the fuchsia source tree,
 /// including a working fx command-line tool in the user's PATH.
 class FuchsiaSdk {
-  static const List<String> _syslogCommand = <String>['fx', 'syslog', '--clock', 'Local'];
-
   /// Example output:
   ///    $ dev_finder list -full
   ///    > 192.168.42.56 paper-pulp-bush-angel
@@ -42,19 +42,33 @@ class FuchsiaSdk {
   /// Returns the fuchsia system logs for an attached device.
   ///
   /// Does not currently support multiple attached devices.
-  Stream<String> syslogs() {
+  Stream<String> syslogs(String id) {
     Process process;
     try {
-      final StreamController<String> controller = StreamController<String>(onCancel: () {
+      final StreamController<String> controller =
+          StreamController<String>(onCancel: () {
         process.kill();
       });
-      processManager.start(_syslogCommand).then((Process newProcess) {
+      if (fuchsiaArtifacts.sshConfig == null) {
+        return null;
+      }
+      const String remoteCommand = 'log_listener --clock Local';
+      final List<String> cmd = <String>[
+        'ssh',
+        '-F',
+        fuchsiaArtifacts.sshConfig.absolute.path,
+        id,
+        remoteCommand
+      ];
+      processManager.start(cmd).then((Process newProcess) {
         if (controller.isClosed) {
           return;
         }
         process = newProcess;
         process.exitCode.whenComplete(controller.close);
-        controller.addStream(process.stdout.transform(utf8.decoder).transform(const LineSplitter()));
+        controller.addStream(process.stdout
+            .transform(utf8.decoder)
+            .transform(const LineSplitter()));
       });
       return controller.stream;
     } catch (exception) {
@@ -69,6 +83,35 @@ class FuchsiaArtifacts {
   /// Creates a new [FuchsiaArtifacts].
   FuchsiaArtifacts({this.sshConfig, this.devFinder});
 
+  /// Creates a new [FuchsiaArtifacts] using the cached Fuchsia SDK.
+  ///
+  /// Finds tools under bin/cache/artifacts/fuchsia/tools.
+  /// Queries environment variables (first FUCHSIA_BUILD_DIR, then
+  /// FUCHSIA_SSH_CONFIG) to find the ssh configuration needed to talk to
+  /// a device.
+  factory FuchsiaArtifacts.find() {
+    final String fuchsia = Cache.instance.getArtifactDirectory('fuchsia').path;
+    final String tools = fs.path.join(fuchsia, 'tools');
+
+    // If FUCHSIA_BUILD_DIR is defined, then look for the ssh_config dir
+    // relative to it. Next, if FUCHSIA_SSH_CONFIG is defined, then use it.
+    // TODO(zra): Consider passing the ssh config path in with a flag.
+    File sshConfig;
+    if (platform.environment.containsKey(_kFuchsiaBuildDir)) {
+      sshConfig = fs.file(fs.path.join(
+          platform.environment[_kFuchsiaSshConfig], 'ssh-keys', 'ssh_config'));
+    } else if (platform.environment.containsKey(_kFuchsiaSshConfig)) {
+      sshConfig = fs.file(platform.environment[_kFuchsiaSshConfig]);
+    }
+    return FuchsiaArtifacts(
+      sshConfig: sshConfig,
+      devFinder: fs.file(fs.path.join(tools, 'dev_finder')),
+    );
+  }
+
+  static const String _kFuchsiaSshConfig = 'FUCHSIA_SSH_CONFIG';
+  static const String _kFuchsiaBuildDir = 'FUCHSIA_BUILD_DIR';
+
   /// The location of the SSH configuration file used to interact with a
   /// Fuchsia device.
   final File sshConfig;

packages/flutter_tools/test/fuchsia/fuchsa_device_test.dart

@@ -66,7 +66,8 @@ void main() {
       any,
       environment: anyNamed('environment'),
       workingDirectory: anyNamed('workingDirectory'),
-    )).thenAnswer((Invocation invocation) => Future<ProcessResult>.value(mockProcessResult));
+    )).thenAnswer((Invocation invocation) =>
+        Future<ProcessResult>.value(mockProcessResult));
     when(mockProcessResult.exitCode).thenReturn(1);
     when<String>(mockProcessResult.stdout).thenReturn('');
     when<String>(mockProcessResult.stderr).thenReturn('');
@@ -79,7 +80,8 @@ void main() {
       any,
       environment: anyNamed('environment'),
       workingDirectory: anyNamed('workingDirectory'),
-    )).thenAnswer((Invocation invocation) => Future<ProcessResult>.value(emptyStdoutProcessResult));
+    )).thenAnswer((Invocation invocation) =>
+        Future<ProcessResult>.value(emptyStdoutProcessResult));
     when(emptyStdoutProcessResult.exitCode).thenReturn(0);
     when<String>(emptyStdoutProcessResult.stdout).thenReturn('');
     when<String>(emptyStdoutProcessResult.stderr).thenReturn('');
@@ -92,23 +94,26 @@ void main() {
       } on ToolExit catch (err) {
         toolExit = err;
       }
-      expect(toolExit.message, contains('No Dart Observatories found. Are you running a debug build?'));
+      expect(
+          toolExit.message,
+          contains(
+              'No Dart Observatories found. Are you running a debug build?'));
     }, overrides: <Type, Generator>{
       ProcessManager: () => emptyStdoutProcessManager,
       FuchsiaArtifacts: () => FuchsiaArtifacts(
-        sshConfig: mockFile,
+            sshConfig: mockFile,
-        devFinder: mockFile,
+            devFinder: mockFile,
-      ),
+          ),
     });
 
     group('device logs', () {
       const String exampleUtcLogs = '''
-[2018-11-09 01:27:45][3][297950920][log] INFO: example_app(flutter): Error doing thing
+[2018-11-09 01:27:45][3][297950920][log] INFO: example_app.cmx(flutter): Error doing thing
 [2018-11-09 01:27:58][46257][46269][foo] INFO: Using a thing
 [2018-11-09 01:29:58][46257][46269][foo] INFO: Blah blah blah
-[2018-11-09 01:29:58][46257][46269][foo] INFO: other_app(flutter): Do thing
+[2018-11-09 01:29:58][46257][46269][foo] INFO: other_app.cmx(flutter): Do thing
 [2018-11-09 01:30:02][41175][41187][bar] INFO: Invoking a bar
-[2018-11-09 01:30:12][52580][52983][log] INFO: example_app(flutter): Did thing this time
+[2018-11-09 01:30:12][52580][52983][log] INFO: example_app.cmx(flutter): Did thing this time
 
   ''';
       final MockProcessManager mockProcessManager = MockProcessManager();
@@ -116,11 +121,17 @@ void main() {
       Completer<int> exitCode;
       StreamController<List<int>> stdout;
       StreamController<List<int>> stderr;
-      when(mockProcessManager.start(any)).thenAnswer((Invocation _) => Future<Process>.value(mockProcess));
+      when(mockProcessManager.start(any))
+          .thenAnswer((Invocation _) => Future<Process>.value(mockProcess));
       when(mockProcess.exitCode).thenAnswer((Invocation _) => exitCode.future);
       when(mockProcess.stdout).thenAnswer((Invocation _) => stdout.stream);
       when(mockProcess.stderr).thenAnswer((Invocation _) => stderr.stream);
 
+      final MockFile devFinder = MockFile();
+      final MockFile sshConfig = MockFile();
+      when(devFinder.absolute).thenReturn(devFinder);
+      when(sshConfig.absolute).thenReturn(sshConfig);
+
       setUp(() {
         stdout = StreamController<List<int>>(sync: true);
         stderr = StreamController<List<int>>(sync: true);
@@ -133,7 +144,8 @@ void main() {
 
       testUsingContext('can be parsed for an app', () async {
         final FuchsiaDevice device = FuchsiaDevice('id', name: 'tester');
-        final DeviceLogReader reader = device.getLogReader(app: FuchsiaModulePackage(name: 'example_app'));
+        final DeviceLogReader reader = device.getLogReader(
+            app: FuchsiaModulePackage(name: 'example_app.cmx'));
         final List<String> logLines = <String>[];
         final Completer<void> lock = Completer<void>();
         reader.logLines.listen((String line) {
@@ -155,11 +167,14 @@ void main() {
       }, overrides: <Type, Generator>{
         ProcessManager: () => mockProcessManager,
         SystemClock: () => SystemClock.fixed(DateTime(2018, 11, 9, 1, 25, 45)),
+        FuchsiaArtifacts: () =>
+            FuchsiaArtifacts(devFinder: devFinder, sshConfig: sshConfig),
       });
 
       testUsingContext('cuts off prior logs', () async {
         final FuchsiaDevice device = FuchsiaDevice('id', name: 'tester');
-        final DeviceLogReader reader = device.getLogReader(app: FuchsiaModulePackage(name: 'example_app'));
+        final DeviceLogReader reader = device.getLogReader(
+            app: FuchsiaModulePackage(name: 'example_app.cmx'));
         final List<String> logLines = <String>[];
         final Completer<void> lock = Completer<void>();
         reader.logLines.listen((String line) {
@@ -178,6 +193,8 @@ void main() {
       }, overrides: <Type, Generator>{
         ProcessManager: () => mockProcessManager,
         SystemClock: () => SystemClock.fixed(DateTime(2018, 11, 9, 1, 29, 45)),
+        FuchsiaArtifacts: () =>
+            FuchsiaArtifacts(devFinder: devFinder, sshConfig: sshConfig),
       });
 
       testUsingContext('can be parsed for all apps', () async {
@@ -205,12 +222,15 @@ void main() {
       }, overrides: <Type, Generator>{
         ProcessManager: () => mockProcessManager,
         SystemClock: () => SystemClock.fixed(DateTime(2018, 11, 9, 1, 25, 45)),
+        FuchsiaArtifacts: () =>
+            FuchsiaArtifacts(devFinder: devFinder, sshConfig: sshConfig),
       });
     });
   });
 
   group(FuchsiaIsolateDiscoveryProtocol, () {
-    Future<Uri> findUri(List<MockFlutterView> views, String expectedIsolateName) {
+    Future<Uri> findUri(
+        List<MockFlutterView> views, String expectedIsolateName) {
       final MockPortForwarder portForwarder = MockPortForwarder();
       final MockVMService vmService = MockVMService();
       final MockVM vm = MockVM();
@@ -220,33 +240,43 @@ void main() {
       for (MockFlutterView view in views) {
         view.owner = vm;
       }
-      final MockFuchsiaDevice fuchsiaDevice = MockFuchsiaDevice('123', portForwarder, false);
+      final MockFuchsiaDevice fuchsiaDevice =
-      final FuchsiaIsolateDiscoveryProtocol discoveryProtocol = FuchsiaIsolateDiscoveryProtocol(
+          MockFuchsiaDevice('123', portForwarder, false);
+      final FuchsiaIsolateDiscoveryProtocol discoveryProtocol =
+          FuchsiaIsolateDiscoveryProtocol(
         fuchsiaDevice,
         expectedIsolateName,
         (Uri uri) async => vmService,
         true, // only poll once.
       );
-      when(fuchsiaDevice.servicePorts()).thenAnswer((Invocation invocation) async => <int>[1]);
+      when(fuchsiaDevice.servicePorts())
-      when(portForwarder.forward(1)).thenAnswer((Invocation invocation) async => 2);
+          .thenAnswer((Invocation invocation) async => <int>[1]);
-      when(vmService.getVM()).thenAnswer((Invocation invocation) => Future<void>.value(null));
+      when(portForwarder.forward(1))
-      when(vmService.refreshViews()).thenAnswer((Invocation invocation) => Future<void>.value(null));
+          .thenAnswer((Invocation invocation) async => 2);
+      when(vmService.getVM())
+          .thenAnswer((Invocation invocation) => Future<void>.value(null));
+      when(vmService.refreshViews())
+          .thenAnswer((Invocation invocation) => Future<void>.value(null));
       when(vmService.httpAddress).thenReturn(Uri.parse('example'));
       return discoveryProtocol.uri;
     }
-    testUsingContext('can find flutter view with matching isolate name', () async {
+
+    testUsingContext('can find flutter view with matching isolate name',
+        () async {
       const String expectedIsolateName = 'foobar';
       final Uri uri = await findUri(<MockFlutterView>[
         MockFlutterView(null), // no ui isolate.
         MockFlutterView(MockIsolate('wrong name')), // wrong name.
         MockFlutterView(MockIsolate(expectedIsolateName)), // matching name.
       ], expectedIsolateName);
-      expect(uri.toString(), 'http://${InternetAddress.loopbackIPv4.address}:0/');
+      expect(
+          uri.toString(), 'http://${InternetAddress.loopbackIPv4.address}:0/');
     }, overrides: <Type, Generator>{
       Logger: () => StdoutLogger(),
     });
 
-    testUsingContext('can handle flutter view without matching isolate name', () async {
+    testUsingContext('can handle flutter view without matching isolate name',
+        () async {
       const String expectedIsolateName = 'foobar';
       final Future<Uri> uri = findUri(<MockFlutterView>[
         MockFlutterView(null), // no ui isolate.

packages/flutter_tools/test/fuchsia/fuchsia_workflow_test.dart

@@ -12,37 +12,47 @@ import '../src/common.dart';
 import '../src/context.dart';
 
 class MockOperatingSystemUtils extends Mock implements OperatingSystemUtils {}
+
 class MockFile extends Mock implements File {}
 
 void main() {
-  group('android workflow', () {
+  group('Fuchsia workflow', () {
     final MockFile devFinder = MockFile();
     final MockFile sshConfig = MockFile();
     when(devFinder.absolute).thenReturn(devFinder);
     when(sshConfig.absolute).thenReturn(sshConfig);
 
-    testUsingContext('can not list and launch devices if there is not ssh config and dev finder', () {
+    testUsingContext(
+        'can not list and launch devices if there is not ssh config and dev finder',
+        () {
       expect(fuchsiaWorkflow.canLaunchDevices, false);
       expect(fuchsiaWorkflow.canListDevices, false);
       expect(fuchsiaWorkflow.canListEmulators, false);
     }, overrides: <Type, Generator>{
-      FuchsiaArtifacts: () => FuchsiaArtifacts(devFinder: null, sshConfig: null),
+      FuchsiaArtifacts: () =>
+          FuchsiaArtifacts(devFinder: null, sshConfig: null),
     });
 
-    testUsingContext('can not list and launch devices if there is not ssh config and dev finder', () {
+    testUsingContext(
+        'can not list and launch devices if there is not ssh config and dev finder',
+        () {
       expect(fuchsiaWorkflow.canLaunchDevices, false);
       expect(fuchsiaWorkflow.canListDevices, true);
       expect(fuchsiaWorkflow.canListEmulators, false);
     }, overrides: <Type, Generator>{
-      FuchsiaArtifacts: () => FuchsiaArtifacts(devFinder: devFinder, sshConfig: null),
+      FuchsiaArtifacts: () =>
+          FuchsiaArtifacts(devFinder: devFinder, sshConfig: null),
     });
 
-    testUsingContext('can list and launch devices supported if there is a `fx` command', () {
+    testUsingContext(
+        'can list and launch devices supported with sufficient SDK artifacts',
+        () {
       expect(fuchsiaWorkflow.canLaunchDevices, true);
       expect(fuchsiaWorkflow.canListDevices, true);
       expect(fuchsiaWorkflow.canListEmulators, false);
     }, overrides: <Type, Generator>{
-      FuchsiaArtifacts: () => FuchsiaArtifacts(devFinder: devFinder, sshConfig: sshConfig),
+      FuchsiaArtifacts: () =>
+          FuchsiaArtifacts(devFinder: devFinder, sshConfig: sshConfig),
     });
   });
 }