[flutter_tools] remove globals from compilers (#59184)

Refactors KernelCompiler and ResidentCompiler to no longer use globals (except as a fallback for g3 migration). Improves the compilation error when running flutter test on a package without a flutter_test dependency.

Updates machine mode to output trace text to stderr

dev/missing_dependency_tests/trivial_expectation.txt

 <<skip until matching line>>
 <<stderr>>
 <<skip until matching line>>
-Failed to load test harness\. +Are you missing a dependency on flutter_test\?
+Error: cannot run without a dependency on "package:flutter_test". Ensure the following lines are present in your pubspec.yaml:
\ No newline at end of file
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter

packages/flutter_tools/lib/executable.dart

@@ -128,7 +128,15 @@ Future<void> main(List<String> args) async {
        // The mustache dependency is different in google3
        TemplateRenderer: () => const MustacheTemplateRenderer(),
        if (daemon)
-        Logger: () => NotifyingLogger(verbose: verbose)
+        Logger: () => NotifyingLogger(
+          verbose: verbose,
+          parent: VerboseLogger(StdoutLogger(
+            timeoutConfiguration: timeoutConfiguration,
+            stdio: globals.stdio,
+            terminal: globals.terminal,
+            outputPreferences: globals.outputPreferences,
+          ),
+        ))
        else if (verbose && !muteCommandLogging)
         Logger: () => VerboseLogger(StdoutLogger(
           timeoutConfiguration: timeoutConfiguration,

packages/flutter_tools/lib/src/artifacts.dart

@@ -159,6 +159,11 @@ class EngineBuildPaths {
 
 // Manages the engine artifacts of Flutter.
 abstract class Artifacts {
+  /// A test-specific implementation of artifacts that returns stable paths for
+  /// all artifacts.
+  @visibleForTesting
+  factory Artifacts.test() = _TestArtifacts;
+
   static LocalEngineArtifacts getLocalEngine(EngineBuildPaths engineBuildPaths) {
     return LocalEngineArtifacts(
       engineBuildPaths.targetEngine,
@@ -183,7 +188,7 @@ abstract class Artifacts {
 
 
 /// Manages the engine artifacts downloaded to the local cache.
-class CachedArtifacts extends Artifacts {
+class CachedArtifacts implements Artifacts {
   CachedArtifacts({
     @required FileSystem fileSystem,
     @required Platform platform,
@@ -449,7 +454,7 @@ HostPlatform _currentHostPlatformAsHost(Platform platform) {
 }
 
 /// Manages the artifacts of a locally built engine.
-class LocalEngineArtifacts extends Artifacts {
+class LocalEngineArtifacts implements Artifacts {
   LocalEngineArtifacts(
     this.engineOutPath,
     this._hostEngineOutPath, {
@@ -648,3 +653,26 @@ class OverrideArtifacts implements Artifacts {
 String _dartSdkPath(FileSystem fileSystem) {
   return fileSystem.path.join(Cache.flutterRoot, 'bin', 'cache', 'dart-sdk');
 }
+
+class _TestArtifacts implements Artifacts {
+  @override
+  String getArtifactPath(Artifact artifact, {TargetPlatform platform, BuildMode mode}) {
+    final StringBuffer buffer = StringBuffer();
+    buffer.write(artifact);
+    if (platform != null) {
+      buffer.write('.$platform');
+    }
+    if (mode != null) {
+      buffer.write('.$mode');
+    }
+    return buffer.toString();
+  }
+
+  @override
+  String getEngineType(TargetPlatform platform, [ BuildMode mode ]) {
+    return 'test-engine';
+  }
+
+  @override
+  bool get isLocalEngine => false;
+}

packages/flutter_tools/lib/src/codegen.dart

@@ -4,8 +4,12 @@
 
 import 'package:meta/meta.dart';
 import 'package:package_config/package_config.dart';
+import 'package:process/process.dart';
 
+import 'artifacts.dart';
 import 'base/context.dart';
+import 'base/file_system.dart';
+import 'base/logger.dart';
 import 'build_info.dart';
 import 'compile.dart';
 import 'globals.dart' as globals;
@@ -63,10 +67,19 @@ abstract class CodegenDaemon {
 /// supported here. Using the build pipeline implies a fixed multi-root
 /// filesystem and requires a pubspec.
 class CodeGeneratingKernelCompiler implements KernelCompiler {
-  const CodeGeneratingKernelCompiler();
-
-  static const KernelCompiler _delegate = KernelCompiler();
-
+  CodeGeneratingKernelCompiler({
+    @required FileSystem fileSystem,
+    @required Artifacts artifacts,
+    @required ProcessManager processManager,
+    @required Logger logger,
+  }) : _delegate = KernelCompiler(
+    logger: logger,
+    artifacts: artifacts,
+    processManager: processManager,
+    fileSystem: fileSystem,
+  );
+
+  final KernelCompiler _delegate;
   @override
   Future<CompilerOutput> compile({
     String mainPath,

packages/flutter_tools/lib/src/commands/attach.dart

@@ -209,7 +209,7 @@ class AttachCommand extends FlutterCommand {
           stdoutCommandResponse,
           notifyingLogger: (globals.logger is NotifyingLogger)
             ? globals.logger as NotifyingLogger
-            : NotifyingLogger(verbose: globals.logger.isVerbose),
+            : NotifyingLogger(verbose: globals.logger.isVerbose, parent: globals.logger),
           logToStdout: true,
         )
       : null;

packages/flutter_tools/lib/src/commands/daemon.dart

@@ -918,13 +918,14 @@ dynamic _toJsonable(dynamic obj) {
 }
 
 class NotifyingLogger extends Logger {
-  NotifyingLogger({ @required this.verbose }) {
+  NotifyingLogger({ @required this.verbose, @required this.parent }) {
     _messageController = StreamController<LogMessage>.broadcast(
       onListen: _onListen,
     );
   }
 
   final bool verbose;
+  final Logger parent;
   final List<LogMessage> messageBuffer = <LogMessage>[];
   StreamController<LogMessage> _messageController;
 
@@ -968,7 +969,7 @@ class NotifyingLogger extends Logger {
     if (!verbose) {
       return;
     }
-    _sendMessage(LogMessage('trace', message));
+    parent.printError(message);
   }
 
   @override

packages/flutter_tools/lib/src/commands/run.dart

@@ -417,7 +417,7 @@ class RunCommand extends RunCommandBase {
         stdoutCommandResponse,
         notifyingLogger: (globals.logger is NotifyingLogger)
           ? globals.logger as NotifyingLogger
-          : NotifyingLogger(verbose: globals.logger.isVerbose),
+          : NotifyingLogger(verbose: globals.logger.isVerbose, parent: globals.logger),
         logToStdout: true,
       );
       AppInstance app;

packages/flutter_tools/lib/src/context_runner.dart

@@ -148,7 +148,12 @@ Future<T> runInContext<T>(
         xcode: globals.xcode,
       ),
       IOSWorkflow: () => const IOSWorkflow(),
-      KernelCompilerFactory: () => const KernelCompilerFactory(),
+      KernelCompilerFactory: () => KernelCompilerFactory(
+        logger: globals.logger,
+        processManager: globals.processManager,
+        artifacts: globals.artifacts,
+        fileSystem: globals.fs,
+      ),
       Logger: () => globals.platform.isWindows
         ? WindowsStdoutLogger(
             terminal: globals.terminal,

packages/flutter_tools/lib/src/resident_runner.dart

@@ -18,7 +18,6 @@ import 'base/file_system.dart';
 import 'base/io.dart' as io;
 import 'base/logger.dart';
 import 'base/signals.dart';
-import 'base/terminal.dart';
 import 'base/utils.dart';
 import 'build_info.dart';
 import 'build_system/build_system.dart';
@@ -63,6 +62,9 @@ class FlutterDevice {
          dartDefines: buildInfo.dartDefines,
          packagesPath: globalPackagesPath,
          extraFrontEndOptions: buildInfo.extraFrontEndOptions,
+         artifacts: globals.artifacts,
+         processManager: globals.processManager,
+         logger: globals.logger,
        );
 
   /// Create a [FlutterDevice] with optional code generation enabled.
@@ -99,9 +101,6 @@ class FlutterDevice {
         // Override the filesystem scheme so that the frontend_server can find
         // the generated entrypoint code.
         fileSystemScheme: 'org-dartlang-app',
-        compilerMessageConsumer:
-          (String message, {bool emphasis, TerminalColor color, }) =>
-            globals.printTrace(message),
         initializeFromDill: getDefaultCachedKernelPath(
           trackWidgetCreation: buildInfo.trackWidgetCreation,
           dartDefines: buildInfo.dartDefines,
@@ -115,6 +114,9 @@ class FlutterDevice {
         librariesSpec: globals.fs.file(globals.artifacts
           .getArtifactPath(Artifact.flutterWebLibrariesJson)).uri.toString(),
         packagesPath: globalPackagesPath,
+        artifacts: globals.artifacts,
+        processManager: globals.processManager,
+        logger: globals.logger,
       );
     } else {
       generator = ResidentCompiler(
@@ -135,6 +137,9 @@ class FlutterDevice {
           dartDefines: buildInfo.dartDefines,
         ),
         packagesPath: globalPackagesPath,
+        artifacts: globals.artifacts,
+        processManager: globals.processManager,
+        logger: globals.logger,
       );
     }
 

packages/flutter_tools/lib/src/test/test_compiler.dart

@@ -9,7 +9,6 @@ import 'package:package_config/package_config.dart';
 
 import '../artifacts.dart';
 import '../base/file_system.dart';
-import '../base/terminal.dart';
 import '../build_info.dart';
 import '../bundle.dart';
 import '../codegen.dart';
@@ -71,11 +70,12 @@ class TestCompiler {
 
   ResidentCompiler compiler;
   File outputDill;
-  // Whether to report compiler messages.
-  bool _suppressOutput = false;
 
   Future<String> compile(Uri mainDart) {
     final Completer<String> completer = Completer<String>();
+    if (compilerController.isClosed) {
+      return null;
+    }
     compilerController.add(_CompilationRequest(mainDart, completer));
     return completer.future;
   }
@@ -99,9 +99,11 @@ class TestCompiler {
   Future<ResidentCompiler> createCompiler() async {
     final ResidentCompiler residentCompiler = ResidentCompiler(
       globals.artifacts.getArtifactPath(Artifact.flutterPatchedSdkPath),
+      artifacts: globals.artifacts,
+      logger: globals.logger,
+      processManager: globals.processManager,
       buildMode: buildMode,
       trackWidgetCreation: trackWidgetCreation,
-      compilerMessageConsumer: _reportCompilerMessage,
       initializeFromDill: testFilePath,
       unsafePackageSerialization: false,
       dartDefines: const <String>[],
@@ -129,10 +131,28 @@ class TestCompiler {
     if (!isEmpty) {
       return;
     }
-    _packageConfig ??= await loadPackageConfigWithLogging(
-      globals.fs.file(globalPackagesPath),
-      logger: globals.logger,
-    );
+    if (_packageConfig == null) {
+      _packageConfig ??= await loadPackageConfigWithLogging(
+        globals.fs.file(globalPackagesPath),
+        logger: globals.logger,
+      );
+      // Compilation will fail if there is no flutter_test dependency, since
+      // this library is imported by the generated entrypoint script.
+      if (_packageConfig['flutter_test'] == null) {
+        globals.printError(
+          '\n'
+          'Error: cannot run without a dependency on "package:flutter_test". '
+          'Ensure the following lines are present in your pubspec.yaml:'
+          '\n\n'
+          'dev_dependencies:\n'
+          '  flutter_test:\n'
+          '    sdk: flutter\n',
+        );
+        request.result.complete(null);
+        await compilerController.close();
+        return;
+      }
+    }
     while (compilationQueue.isNotEmpty) {
       final _CompilationRequest request = compilationQueue.first;
       globals.printTrace('Compiling ${request.mainUri}');
@@ -142,7 +162,6 @@ class TestCompiler {
         compiler = await createCompiler();
         firstCompile = true;
       }
-      _suppressOutput = false;
       final CompilerOutput compilerOutput = await compiler.recompile(
         request.mainUri,
         <Uri>[request.mainUri],
@@ -179,20 +198,4 @@ class TestCompiler {
       compilationQueue.removeAt(0);
     }
   }
-
-  void _reportCompilerMessage(String message, {bool emphasis, TerminalColor color}) {
-    if (_suppressOutput) {
-      return;
-    }
-    if (message.startsWith("Error: Could not resolve the package 'flutter_test'")) {
-      globals.printTrace(message);
-      globals.printError('\n\nFailed to load test harness. Are you missing a dependency on flutter_test?\n',
-        emphasis: emphasis,
-        color: color,
-      );
-      _suppressOutput = true;
-      return;
-    }
-    globals.printError(message);
-  }
 }

packages/flutter_tools/test/commands.shard/hermetic/daemon_test.dart

@@ -21,10 +21,12 @@ import '../../src/mocks.dart';
 void main() {
   Daemon daemon;
   NotifyingLogger notifyingLogger;
+  BufferLogger bufferLogger;
 
   group('daemon', () {
     setUp(() {
-      notifyingLogger = NotifyingLogger(verbose: false);
+      bufferLogger = BufferLogger.test();
+      notifyingLogger = NotifyingLogger(verbose: false, parent: bufferLogger);
     });
 
     tearDown(() {
@@ -299,19 +301,15 @@ void main() {
   });
 
   testUsingContext('notifyingLogger outputs trace messages in verbose mode', () async {
-    final NotifyingLogger logger = NotifyingLogger(verbose: true);
+    final NotifyingLogger logger = NotifyingLogger(verbose: true, parent: bufferLogger);
 
-    final Future<LogMessage> messageResult = logger.onMessage.first;
     logger.printTrace('test');
 
-    final LogMessage message = await messageResult;
-
-    expect(message.level, 'trace');
-    expect(message.message, 'test');
+    expect(bufferLogger.errorText, contains('test'));
   });
 
   testUsingContext('notifyingLogger ignores trace messages in non-verbose mode', () async {
-    final NotifyingLogger logger = NotifyingLogger(verbose: false);
+    final NotifyingLogger logger = NotifyingLogger(verbose: false, parent: bufferLogger);
 
     final Future<LogMessage> messageResult = logger.onMessage.first;
     logger.printTrace('test');
@@ -321,10 +319,11 @@ void main() {
 
     expect(message.level, 'status');
     expect(message.message, 'hello');
+    expect(bufferLogger.errorText, contains('test'));
   });
 
   testUsingContext('notifyingLogger buffers messages sent before a subscription', () async {
-    final NotifyingLogger logger = NotifyingLogger(verbose: false);
+    final NotifyingLogger logger = NotifyingLogger(verbose: false, parent: bufferLogger);
 
     logger.printStatus('hello');
 

packages/flutter_tools/test/general.shard/compile_expression_test.dart

@@ -4,14 +4,13 @@
 
 import 'dart:async';
 
+import 'package:flutter_tools/src/artifacts.dart';
 import 'package:flutter_tools/src/base/common.dart';
 import 'package:flutter_tools/src/base/io.dart';
-import 'package:flutter_tools/src/base/platform.dart';
-import 'package:flutter_tools/src/base/terminal.dart';
+import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/compile.dart';
 import 'package:flutter_tools/src/convert.dart';
-import 'package:flutter_tools/src/globals.dart' as globals;
 import 'package:mockito/mockito.dart';
 import 'package:package_config/package_config.dart';
 import 'package:process/process.dart';
@@ -27,13 +26,21 @@ void main() {
   MockStdIn mockFrontendServerStdIn;
   MockStream mockFrontendServerStdErr;
   StreamController<String> stdErrStreamController;
+  BufferLogger testLogger;
 
   setUp(() {
-    generator = ResidentCompiler('sdkroot',  buildMode: BuildMode.debug);
+    testLogger = BufferLogger.test();
     mockProcessManager = MockProcessManager();
     mockFrontendServer = MockProcess();
     mockFrontendServerStdIn = MockStdIn();
     mockFrontendServerStdErr = MockStream();
+    generator = ResidentCompiler(
+      'sdkroot',
+      buildMode: BuildMode.debug,
+      artifacts: Artifacts.test(),
+      processManager: mockProcessManager,
+      logger: testLogger,
+    );
 
     when(mockFrontendServer.stdin).thenReturn(mockFrontendServerStdIn);
     when(mockFrontendServer.stderr)
@@ -52,13 +59,14 @@ void main() {
     );
   });
 
-  testUsingContext('compile expression fails if not previously compiled', () async {
+  testWithoutContext('compile expression fails if not previously compiled', () async {
     final CompilerOutput result = await generator.compileExpression(
         '2+2', null, null, null, null, false);
+
     expect(result, isNull);
   });
 
-  testUsingContext('compile expression can compile single expression', () async {
+  testWithoutContext('compile expression can compile single expression', () async {
     final Completer<List<int>> compileResponseCompleter =
         Completer<List<int>>();
     final Completer<List<int>> compileExpressionResponseCompleter =
@@ -76,7 +84,7 @@ void main() {
     )));
 
     await generator.recompile(
-      globals.fs.file('/path/to/main.dart').uri,
+      Uri.file('/path/to/main.dart'),
       null, /* invalidatedFiles */
       outputPath: '/build/',
       packageConfig: PackageConfig.empty,
@@ -101,14 +109,9 @@ void main() {
               }
       );
     });
-
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 
-  testUsingContext('compile expressions without awaiting', () async {
+  testWithoutContext('compile expressions without awaiting', () async {
     final Completer<List<int>> compileResponseCompleter = Completer<List<int>>();
     final Completer<List<int>> compileExpressionResponseCompleter1 = Completer<List<int>>();
     final Completer<List<int>> compileExpressionResponseCompleter2 = Completer<List<int>>();
@@ -174,10 +177,6 @@ void main() {
     )));
 
     expect(await lastExpressionCompleted.future, isTrue);
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 }
 

packages/flutter_tools/test/general.shard/compile_incremental_test.dart

@@ -4,10 +4,10 @@
 
 import 'dart:async';
 
+import 'package:flutter_tools/src/artifacts.dart';
 import 'package:flutter_tools/src/base/async_guard.dart';
 import 'package:flutter_tools/src/base/io.dart';
-import 'package:flutter_tools/src/base/platform.dart';
-import 'package:flutter_tools/src/base/terminal.dart';
+import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/compile.dart';
 import 'package:flutter_tools/src/convert.dart';
@@ -26,13 +26,21 @@ void main() {
   MockStdIn mockFrontendServerStdIn;
   MockStream mockFrontendServerStdErr;
   StreamController<String> stdErrStreamController;
+  BufferLogger testLogger;
 
   setUp(() {
-    generator = ResidentCompiler('sdkroot', buildMode: BuildMode.debug);
+    testLogger = BufferLogger.test();
     mockProcessManager = MockProcessManager();
     mockFrontendServer = MockProcess();
     mockFrontendServerStdIn = MockStdIn();
     mockFrontendServerStdErr = MockStream();
+    generator = ResidentCompiler(
+      'sdkroot',
+      buildMode: BuildMode.debug,
+      logger: testLogger,
+      processManager: mockProcessManager,
+      artifacts: Artifacts.test(),
+    );
 
     when(mockFrontendServer.stdin).thenReturn(mockFrontendServerStdIn);
     when(mockFrontendServer.stderr)
@@ -50,7 +58,7 @@ void main() {
     );
   });
 
-  testUsingContext('incremental compile single dart compile', () async {
+  testWithoutContext('incremental compile single dart compile', () async {
     when(mockFrontendServer.stdout)
         .thenAnswer((Invocation invocation) => Stream<List<int>>.fromFuture(
           Future<List<int>>.value(utf8.encode(
@@ -68,13 +76,9 @@ void main() {
     verifyNoMoreInteractions(mockFrontendServerStdIn);
     expect(testLogger.errorText, equals('line1\nline2\n'));
     expect(output.outputFilename, equals('/path/to/main.dart.dill'));
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 
-  testUsingContext('incremental compile single dart compile abnormally terminates', () async {
+  testWithoutContext('incremental compile single dart compile abnormally terminates', () async {
     when(mockFrontendServer.stdout)
         .thenAnswer((Invocation invocation) => const Stream<List<int>>.empty()
     );
@@ -85,13 +89,9 @@ void main() {
       outputPath: '/build/',
       packageConfig: PackageConfig.empty,
     )), throwsToolExit());
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 
-  testUsingContext('incremental compile single dart compile abnormally terminates via exitCode', () async {
+  testWithoutContext('incremental compile single dart compile abnormally terminates via exitCode', () async {
     when(mockFrontendServer.exitCode)
         .thenAnswer((Invocation invocation) async => 1);
     when(mockFrontendServer.stdout)
@@ -104,13 +104,9 @@ void main() {
       outputPath: '/build/',
       packageConfig: PackageConfig.empty,
     )), throwsToolExit());
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 
-  testUsingContext('incremental compile and recompile', () async {
+  testWithoutContext('incremental compile and recompile', () async {
     final StreamController<List<int>> streamController = StreamController<List<int>>();
     when(mockFrontendServer.stdout)
         .thenAnswer((Invocation invocation) => streamController.stream);
@@ -145,13 +141,9 @@ void main() {
       'line1\nline2\n'
       'line1\nline2\n'
     ));
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 
-  testUsingContext('incremental compile can suppress errors', () async {
+  testWithoutContext('incremental compile can suppress errors', () async {
     final StreamController<List<int>> stdoutController = StreamController<List<int>>();
     when(mockFrontendServer.stdout)
       .thenAnswer((Invocation invocation) => stdoutController.stream);
@@ -179,17 +171,14 @@ void main() {
 
     // Compiler message is not printed with suppressErrors: true above.
     expect(testLogger.errorText, isNot(equals(
-      'line0\nline1\n'
-      'line1\nline2\n'
       'line1\nline2\n'
     )));
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
+    expect(testLogger.traceText, contains(
+      'line1\nline2\n'
+    ));
   });
 
-  testUsingContext('incremental compile and recompile twice', () async {
+  testWithoutContext('incremental compile and recompile twice', () async {
     final StreamController<List<int>> streamController = StreamController<List<int>>();
     when(mockFrontendServer.stdout)
         .thenAnswer((Invocation invocation) => streamController.stream);
@@ -216,10 +205,6 @@ void main() {
       'line1\nline2\n'
       'line2\nline3\n'
     ));
-  }, overrides: <Type, Generator>{
-    ProcessManager: () => mockProcessManager,
-    OutputPreferences: () => OutputPreferences(showColor: false),
-    Platform: kNoColorTerminalPlatform,
   });
 }
 

packages/flutter_tools/test/general.shard/compile_test.dart

@@ -2,14 +2,14 @@
 // 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/logger.dart';
 import 'package:flutter_tools/src/compile.dart';
 
 import '../src/common.dart';
-import '../src/context.dart';
 
 void main() {
-  testUsingContext('StdOutHandler test', () async {
-    final StdoutHandler stdoutHandler = StdoutHandler();
+  testWithoutContext('StdoutHandler can produce output message', () async {
+    final StdoutHandler stdoutHandler = StdoutHandler(logger: BufferLogger.test());
     stdoutHandler.handler('result 12345');
     expect(stdoutHandler.boundaryKey, '12345');
     stdoutHandler.handler('12345');
@@ -19,7 +19,7 @@ void main() {
     expect(output.outputFilename, 'message');
   });
 
-  test('TargetModel values', () {
+  testWithoutContext('TargetModel values', () {
     expect(TargetModel('vm'), TargetModel.vm);
     expect(TargetModel.vm.toString(), 'vm');
 

packages/flutter_tools/test/general.shard/test_compiler_test.dart

@@ -12,6 +12,7 @@ import 'package:flutter_tools/src/test/test_compiler.dart';
 import 'package:mockito/mockito.dart';
 
 import '../src/common.dart';
+import '../src/context.dart';
 import '../src/testbed.dart';
 
 final Platform linuxPlatform = FakePlatform(
@@ -32,7 +33,7 @@ void main() {
         },
         setup: () async {
           globals.fs.file('pubspec.yaml').createSync();
-          globals.fs.file('.packages').createSync();
+          globals.fs.file('.packages').writeAsStringSync('flutter_test:flutter_test/');
           globals.fs.file('test/foo.dart').createSync(recursive: true);
           residentCompiler = MockResidentCompiler();
           testCompiler = FakeTestCompiler(
@@ -86,6 +87,19 @@ void main() {
       expect(testCompiler.compilerController.isClosed, true);
       verify(residentCompiler.shutdown()).called(1);
     }));
+
+    test('Reports an error when there is no dependency on flutter_test', () => testbed.run(() async {
+      globals.fs.file('.packages').writeAsStringSync('\n');
+
+      expect(await testCompiler.compile(Uri.parse('test/foo.dart')), null);
+      expect(testLogger.errorText, contains('Error: cannot run without a dependency on "package:flutter_test"'));
+      verifyNever(residentCompiler.recompile(
+        any,
+        <Uri>[Uri.parse('test/foo.dart')],
+        outputPath: testCompiler.outputDill.path,
+        packageConfig: anyNamed('packageConfig'),
+      ));
+    }));
   });
 }
 

packages/flutter_tools/test/src/mocks.dart

@@ -244,11 +244,11 @@ class FakeProcess implements Process {
   FakeProcess({
     this.pid = 1,
     Future<int> exitCode,
-    Stream<List<int>> stdin,
+    IOSink stdin,
     this.stdout = const Stream<List<int>>.empty(),
     this.stderr = const Stream<List<int>>.empty(),
   }) : exitCode = exitCode ?? Future<int>.value(0),
-       stdin = stdin as IOSink ?? MemoryIOSink();
+       stdin = stdin ?? MemoryIOSink();
 
   @override
   final int pid;