diff --git a/packages/flutter_tools/lib/src/android/android_device_discovery.dart b/packages/flutter_tools/lib/src/android/android_device_discovery.dart
index 41eb5e99b9..8b144d52c6 100644
--- a/packages/flutter_tools/lib/src/android/android_device_discovery.dart
+++ b/packages/flutter_tools/lib/src/android/android_device_discovery.dart
@@ -16,7 +16,7 @@ import '../device.dart';
 import 'adb.dart';
 import 'android_device.dart';
 import 'android_sdk.dart';
-import 'android_workflow.dart' hide androidWorkflow;
+import 'android_workflow.dart';
 
 /// Device discovery for Android physical devices and emulators.
 ///
diff --git a/packages/flutter_tools/lib/src/android/android_sdk.dart b/packages/flutter_tools/lib/src/android/android_sdk.dart
index 8daed2fe09..674227a57a 100644
--- a/packages/flutter_tools/lib/src/android/android_sdk.dart
+++ b/packages/flutter_tools/lib/src/android/android_sdk.dart
@@ -382,7 +382,7 @@ class AndroidSdk {
             return fileSystem.path.join(javaHome, 'bin', 'java');
           }
         }
-      } on Exception catch (_) { /* ignore */ }
+      } on Exception { /* ignore */ }
     }
 
     // Fallback to PATH based lookup.
diff --git a/packages/flutter_tools/lib/src/android/android_workflow.dart b/packages/flutter_tools/lib/src/android/android_workflow.dart
index 4f7bc62353..db2426e50c 100644
--- a/packages/flutter_tools/lib/src/android/android_workflow.dart
+++ b/packages/flutter_tools/lib/src/android/android_workflow.dart
@@ -12,12 +12,11 @@ import '../base/io.dart';
 import '../base/logger.dart';
 import '../base/os.dart';
 import '../base/platform.dart';
-import '../base/user_messages.dart';
+import '../base/user_messages.dart' hide userMessages;
 import '../base/version.dart';
 import '../convert.dart';
 import '../doctor.dart';
 import '../features.dart';
-import '../globals.dart' as globals;
 import 'android_sdk.dart';
 import 'android_studio.dart';
 
@@ -252,7 +251,36 @@ class AndroidValidator extends DoctorValidator {
 /// A subvalidator that checks if the licenses within the detected Android
 /// SDK have been accepted.
 class AndroidLicenseValidator extends DoctorValidator {
-  AndroidLicenseValidator() : super('Android license subvalidator',);
+  AndroidLicenseValidator({
+    @required AndroidSdk androidSdk,
+    @required Platform platform,
+    @required OperatingSystemUtils operatingSystemUtils,
+    @required FileSystem fileSystem,
+    @required ProcessManager processManager,
+    @required Logger logger,
+    @required AndroidStudio androidStudio,
+    @required Stdio stdio,
+    @required UserMessages userMessages,
+  }) : _androidSdk = androidSdk,
+       _platform = platform,
+       _operatingSystemUtils = operatingSystemUtils,
+       _fileSystem = fileSystem,
+       _processManager = processManager,
+       _logger = logger,
+       _androidStudio = androidStudio,
+       _stdio = stdio,
+       _userMessages = userMessages,
+       super('Android license subvalidator');
+
+  final AndroidSdk _androidSdk;
+  final AndroidStudio _androidStudio;
+  final Stdio _stdio;
+  final OperatingSystemUtils _operatingSystemUtils;
+  final Platform _platform;
+  final FileSystem _fileSystem;
+  final ProcessManager _processManager;
+  final Logger _logger;
+  final UserMessages _userMessages;
 
   @override
   String get slowWarning => 'Checking Android licenses is taking an unexpectedly long time...';
@@ -262,27 +290,27 @@ class AndroidLicenseValidator extends DoctorValidator {
     final List<ValidationMessage> messages = <ValidationMessage>[];
 
     // Match pre-existing early termination behavior
-    if (globals.androidSdk == null || globals.androidSdk.latestVersion == null ||
-        globals.androidSdk.validateSdkWellFormed().isNotEmpty ||
+    if (_androidSdk == null || _androidSdk.latestVersion == null ||
+        _androidSdk.validateSdkWellFormed().isNotEmpty ||
         ! await _checkJavaVersionNoOutput()) {
       return ValidationResult(ValidationType.missing, messages);
     }
 
-    final String sdkVersionText = userMessages.androidStatusInfo(globals.androidSdk.latestVersion.buildToolsVersionName);
+    final String sdkVersionText = _userMessages.androidStatusInfo(_androidSdk.latestVersion.buildToolsVersionName);
 
     // Check for licenses.
     switch (await licensesAccepted) {
       case LicensesAccepted.all:
-        messages.add(ValidationMessage(userMessages.androidLicensesAll));
+        messages.add(ValidationMessage(_userMessages.androidLicensesAll));
         break;
       case LicensesAccepted.some:
-        messages.add(ValidationMessage.hint(userMessages.androidLicensesSome));
+        messages.add(ValidationMessage.hint(_userMessages.androidLicensesSome));
         return ValidationResult(ValidationType.partial, messages, statusInfo: sdkVersionText);
       case LicensesAccepted.none:
-        messages.add(ValidationMessage.error(userMessages.androidLicensesNone));
+        messages.add(ValidationMessage.error(_userMessages.androidLicensesNone));
         return ValidationResult(ValidationType.partial, messages, statusInfo: sdkVersionText);
       case LicensesAccepted.unknown:
-        messages.add(ValidationMessage.error(userMessages.androidLicensesUnknown(globals.platform)));
+        messages.add(ValidationMessage.error(_userMessages.androidLicensesUnknown(_platform)));
         return ValidationResult(ValidationType.partial, messages, statusInfo: sdkVersionText);
     }
     return ValidationResult(ValidationType.installed, messages, statusInfo: sdkVersionText);
@@ -290,26 +318,26 @@ class AndroidLicenseValidator extends DoctorValidator {
 
   Future<bool> _checkJavaVersionNoOutput() async {
     final String javaBinary = AndroidSdk.findJavaBinary(
-      androidStudio: globals.androidStudio,
-      fileSystem: globals.fs,
-      operatingSystemUtils: globals.os,
-      platform: globals.platform,
+      androidStudio: _androidStudio,
+      fileSystem: _fileSystem,
+      operatingSystemUtils: _operatingSystemUtils,
+      platform: _platform,
     );
     if (javaBinary == null) {
       return false;
     }
-    if (!globals.processManager.canRun(javaBinary)) {
+    if (!_processManager.canRun(javaBinary)) {
       return false;
     }
     String javaVersion;
     try {
-      final ProcessResult result = await globals.processManager.run(<String>[javaBinary, '-version']);
+      final ProcessResult result = await _processManager.run(<String>[javaBinary, '-version']);
       if (result.exitCode == 0) {
         final List<String> versionLines = (result.stderr as String).split('\n');
         javaVersion = versionLines.length >= 2 ? versionLines[1] : versionLines[0];
       }
     } on Exception catch (error) {
-      globals.printTrace(error.toString());
+      _logger.printTrace(error.toString());
     }
     if (javaVersion == null) {
       // Could not determine the java version.
@@ -344,9 +372,9 @@ class AndroidLicenseValidator extends DoctorValidator {
     }
 
     try {
-      final Process process = await globals.processUtils.start(
-        <String>[globals.androidSdk.sdkManagerPath, '--licenses'],
-        environment: globals.androidSdk.sdkManagerEnv,
+      final Process process = await _processManager.start(
+        <String>[_androidSdk.sdkManagerPath, '--licenses'],
+        environment: _androidSdk.sdkManagerEnv,
       );
       process.stdin.write('n\n');
       // We expect logcat streams to occasionally contain invalid utf-8,
@@ -364,36 +392,36 @@ class AndroidLicenseValidator extends DoctorValidator {
       await Future.wait<void>(<Future<void>>[output, errors]);
       return status ?? LicensesAccepted.unknown;
     } on ProcessException catch (e) {
-      globals.printTrace('Failed to run Android sdk manager: $e');
+      _logger.printTrace('Failed to run Android sdk manager: $e');
       return LicensesAccepted.unknown;
     }
   }
 
   /// Run the Android SDK manager tool in order to accept SDK licenses.
-  static Future<bool> runLicenseManager() async {
-    if (globals.androidSdk == null) {
-      globals.printStatus(userMessages.androidSdkShort);
+  Future<bool> runLicenseManager() async {
+    if (_androidSdk == null) {
+      _logger.printStatus(_userMessages.androidSdkShort);
       return false;
     }
 
     if (!_canRunSdkManager()) {
-      throwToolExit(userMessages.androidMissingSdkManager(globals.androidSdk.sdkManagerPath, globals.platform));
+      throwToolExit(_userMessages.androidMissingSdkManager(_androidSdk.sdkManagerPath, _platform));
     }
 
     try {
-      final Process process = await globals.processUtils.start(
-        <String>[globals.androidSdk.sdkManagerPath, '--licenses'],
-        environment: globals.androidSdk.sdkManagerEnv,
+      final Process process = await _processManager.start(
+        <String>[_androidSdk.sdkManagerPath, '--licenses'],
+        environment: _androidSdk.sdkManagerEnv,
       );
 
       // The real stdin will never finish streaming. Pipe until the child process
       // finishes.
-      unawaited(process.stdin.addStream(globals.stdio.stdin)
+      unawaited(process.stdin.addStream(_stdio.stdin)
         // If the process exits unexpectedly with an error, that will be
         // handled by the caller.
         .catchError((dynamic err, StackTrace stack) {
-          globals.printTrace('Echoing stdin to the licenses subprocess failed:');
-          globals.printTrace('$err\n$stack');
+          _logger.printTrace('Echoing stdin to the licenses subprocess failed:');
+          _logger.printTrace('$err\n$stack');
         }
       ));
 
@@ -401,29 +429,28 @@ class AndroidLicenseValidator extends DoctorValidator {
       // may complete first.
       try {
         await Future.wait<void>(<Future<void>>[
-          globals.stdio.addStdoutStream(process.stdout),
-          globals.stdio.addStderrStream(process.stderr),
+          _stdio.addStdoutStream(process.stdout),
+          _stdio.addStderrStream(process.stderr),
         ]);
       } on Exception catch (err, stack) {
-        globals.printTrace('Echoing stdout or stderr from the license subprocess failed:');
-        globals.printTrace('$err\n$stack');
+        _logger.printTrace('Echoing stdout or stderr from the license subprocess failed:');
+        _logger.printTrace('$err\n$stack');
       }
 
       final int exitCode = await process.exitCode;
       return exitCode == 0;
     } on ProcessException catch (e) {
-      throwToolExit(userMessages.androidCannotRunSdkManager(
-        globals.androidSdk.sdkManagerPath,
+      throwToolExit(_userMessages.androidCannotRunSdkManager(
+        _androidSdk.sdkManagerPath,
         e.toString(),
-        globals.platform,
+        _platform,
       ));
       return false;
     }
   }
 
-  static bool _canRunSdkManager() {
-    assert(globals.androidSdk != null);
-    final String sdkManagerPath = globals.androidSdk.sdkManagerPath;
-    return globals.processManager.canRun(sdkManagerPath);
+  bool _canRunSdkManager() {
+    final String sdkManagerPath = _androidSdk.sdkManagerPath;
+    return _processManager.canRun(sdkManagerPath);
   }
 }
diff --git a/packages/flutter_tools/lib/src/commands/doctor.dart b/packages/flutter_tools/lib/src/commands/doctor.dart
index 7f834115cf..32e045e0e3 100644
--- a/packages/flutter_tools/lib/src/commands/doctor.dart
+++ b/packages/flutter_tools/lib/src/commands/doctor.dart
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import '../android/android_workflow.dart';
 import '../base/common.dart';
 import '../globals.dart' as globals;
 import '../runner/flutter_command.dart';
@@ -44,7 +45,11 @@ class DoctorCommand extends FlutterCommand {
             'git hash.');
       }
     }
-    final bool success = await globals.doctor.diagnose(androidLicenses: boolArg('android-licenses'), verbose: verbose);
+    final bool success = await globals.doctor.diagnose(
+      androidLicenses: boolArg('android-licenses'),
+      verbose: verbose,
+      androidLicenseValidator: androidLicenseValidator,
+    );
     return FlutterCommandResult(success ? ExitStatus.success : ExitStatus.warning);
   }
 }
diff --git a/packages/flutter_tools/lib/src/context_runner.dart b/packages/flutter_tools/lib/src/context_runner.dart
index ee3a80fb8a..fb9f7e9e20 100644
--- a/packages/flutter_tools/lib/src/context_runner.dart
+++ b/packages/flutter_tools/lib/src/context_runner.dart
@@ -72,7 +72,17 @@ Future<T> runInContext<T>(
     body: runnerWrapper,
     overrides: overrides,
     fallbacks: <Type, Generator>{
-      AndroidLicenseValidator: () => AndroidLicenseValidator(),
+      AndroidLicenseValidator: () => AndroidLicenseValidator(
+        operatingSystemUtils: globals.os,
+        platform: globals.platform,
+        userMessages: globals.userMessages,
+        processManager: globals.processManager,
+        androidStudio: globals.androidStudio,
+        androidSdk: globals.androidSdk,
+        logger: globals.logger,
+        fileSystem: globals.fs,
+        stdio: globals.stdio,
+      ),
       AndroidSdk: AndroidSdk.locateAndroidSdk,
       AndroidStudio: AndroidStudio.latestValid,
       AndroidValidator: () => AndroidValidator(
diff --git a/packages/flutter_tools/lib/src/doctor.dart b/packages/flutter_tools/lib/src/doctor.dart
index d91b783db3..0f1f9fedca 100644
--- a/packages/flutter_tools/lib/src/doctor.dart
+++ b/packages/flutter_tools/lib/src/doctor.dart
@@ -288,9 +288,14 @@ class Doctor {
   }
 
   /// Print information about the state of installed tooling.
-  Future<bool> diagnose({ bool androidLicenses = false, bool verbose = true, bool showColor = true }) async {
-    if (androidLicenses) {
-      return AndroidLicenseValidator.runLicenseManager();
+  Future<bool> diagnose({
+    bool androidLicenses = false,
+    bool verbose = true,
+    bool showColor = true,
+    AndroidLicenseValidator androidLicenseValidator,
+  }) async {
+    if (androidLicenses && androidLicenseValidator != null) {
+      return androidLicenseValidator.runLicenseManager();
     }
 
     if (!verbose) {
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/doctor_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/doctor_test.dart
index c9f3f69a45..709d1e78cc 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/doctor_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/doctor_test.dart
@@ -7,6 +7,7 @@ import 'dart:async';
 import 'package:args/command_runner.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/android/android_studio_validator.dart';
+import 'package:flutter_tools/src/android/android_workflow.dart';
 import 'package:flutter_tools/src/base/common.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/logger.dart';
@@ -704,7 +705,12 @@ class NoOpDoctor implements Doctor {
   Future<bool> checkRemoteArtifacts(String engineRevision) async => true;
 
   @override
-  Future<bool> diagnose({ bool androidLicenses = false, bool verbose = true, bool showColor = true }) async => true;
+  Future<bool> diagnose({
+    bool androidLicenses = false,
+    bool verbose = true,
+    bool showColor = true,
+    AndroidLicenseValidator androidLicenseValidator,
+  }) async => true;
 
   @override
   List<ValidatorTask> startValidatorTasks() => <ValidatorTask>[];
diff --git a/packages/flutter_tools/test/general.shard/analytics_test.dart b/packages/flutter_tools/test/general.shard/analytics_test.dart
index 97e415ba1f..377f04ca55 100644
--- a/packages/flutter_tools/test/general.shard/analytics_test.dart
+++ b/packages/flutter_tools/test/general.shard/analytics_test.dart
@@ -173,6 +173,7 @@ void main() {
       when(mockDoctor.diagnose(
         androidLicenses: false,
         verbose: false,
+        androidLicenseValidator: anyNamed('androidLicenseValidator')
       )).thenAnswer((_) async => true);
       final DoctorCommand command = DoctorCommand();
       final CommandRunner<void> runner = createTestCommandRunner(command);
@@ -197,7 +198,8 @@ void main() {
 
     testUsingContext('doctor fail sends warning', () async {
       mockTimes = <int>[1000, 2000];
-      when(mockDoctor.diagnose(androidLicenses: false, verbose: false)).thenAnswer((_) async => false);
+      when(mockDoctor.diagnose(androidLicenses: false, verbose: false, androidLicenseValidator: anyNamed('androidLicenseValidator')))
+        .thenAnswer((_) async => false);
       final DoctorCommand command = DoctorCommand();
       final CommandRunner<void> runner = createTestCommandRunner(command);
       await runner.run(<String>['doctor']);
diff --git a/packages/flutter_tools/test/general.shard/android/android_workflow_test.dart b/packages/flutter_tools/test/general.shard/android/android_workflow_test.dart
index 60f228a461..3a377ff9f1 100644
--- a/packages/flutter_tools/test/general.shard/android/android_workflow_test.dart
+++ b/packages/flutter_tools/test/general.shard/android/android_workflow_test.dart
@@ -5,17 +5,14 @@
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/android/android_sdk.dart';
 import 'package:flutter_tools/src/android/android_workflow.dart';
-import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/os.dart';
 import 'package:flutter_tools/src/base/platform.dart';
-import 'package:flutter_tools/src/base/terminal.dart' show AnsiTerminal, OutputPreferences;
 import 'package:flutter_tools/src/base/user_messages.dart';
 import 'package:flutter_tools/src/base/version.dart';
 import 'package:flutter_tools/src/doctor.dart';
 import 'package:mockito/mockito.dart';
-import 'package:process/process.dart';
 
 import '../../src/common.dart';
 import '../../src/context.dart';
@@ -28,25 +25,17 @@ class MockOperatingSystemUtils extends Mock implements OperatingSystemUtils {}
 void main() {
   AndroidSdk sdk;
   Logger logger;
-  MemoryFileSystem fs;
+  MemoryFileSystem fileSystem;
   MockProcessManager processManager;
   MockStdio stdio;
-  UserMessages userMessages;
 
   setUp(() {
     sdk = MockAndroidSdk();
-    fs = MemoryFileSystem.test();
-    fs.directory('/home/me').createSync(recursive: true);
-    logger = BufferLogger(
-      terminal: AnsiTerminal(
-        stdio: null,
-        platform: const LocalPlatform(),
-      ),
-      outputPreferences: OutputPreferences.test(),
-    );
+    fileSystem = MemoryFileSystem.test();
+    fileSystem.directory('/home/me').createSync(recursive: true);
+    logger = BufferLogger.test();
     processManager = MockProcessManager();
     stdio = MockStdio();
-    userMessages = UserMessages();
   });
 
   MockProcess Function(List<String>) processMetaFactory(List<String> stdout) {
@@ -80,68 +69,88 @@ void main() {
   });
 
 
-  testUsingContext('licensesAccepted returns LicensesAccepted.unknown if cannot find sdkmanager', () async {
+  testWithoutContext('licensesAccepted returns LicensesAccepted.unknown if cannot find sdkmanager', () async {
     processManager.canRunSucceeds = false;
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted licenseStatus = await licenseValidator.licensesAccepted;
-    expect(licenseStatus, LicensesAccepted.unknown);
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
 
-  testUsingContext('licensesAccepted returns LicensesAccepted.unknown if cannot run sdkmanager', () async {
+    expect(licenseStatus, LicensesAccepted.unknown);
+  });
+
+  testWithoutContext('licensesAccepted returns LicensesAccepted.unknown if cannot run sdkmanager', () async {
     processManager.runSucceeds = false;
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted licenseStatus = await licenseValidator.licensesAccepted;
-    expect(licenseStatus, LicensesAccepted.unknown);
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
 
-  testUsingContext('licensesAccepted handles garbage/no output', () async {
+    expect(licenseStatus, LicensesAccepted.unknown);
+  });
+
+  testWithoutContext('licensesAccepted handles garbage/no output', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted result = await licenseValidator.licensesAccepted;
+
     expect(result, equals(LicensesAccepted.unknown));
     expect(processManager.commands.first, equals('/foo/bar/sdkmanager'));
     expect(processManager.commands.last, equals('--licenses'));
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
+  });
 
-  testUsingContext('licensesAccepted works for all licenses accepted', () async {
+  testWithoutContext('licensesAccepted works for all licenses accepted', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     processManager.processFactory = processMetaFactory(<String>[
       '[=======================================] 100% Computing updates...             ',
       'All SDK package licenses accepted.',
     ]);
 
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted result = await licenseValidator.licensesAccepted;
-    expect(result, equals(LicensesAccepted.all));
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
 
-  testUsingContext('licensesAccepted works for some licenses accepted', () async {
+    expect(result, equals(LicensesAccepted.all));
+  });
+
+  testWithoutContext('licensesAccepted works for some licenses accepted', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     processManager.processFactory = processMetaFactory(<String>[
       '[=======================================] 100% Computing updates...             ',
@@ -149,18 +158,23 @@ void main() {
       'Review licenses that have not been accepted (y/N)?',
     ]);
 
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted result = await licenseValidator.licensesAccepted;
-    expect(result, equals(LicensesAccepted.some));
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
 
-  testUsingContext('licensesAccepted works for no licenses accepted', () async {
+    expect(result, equals(LicensesAccepted.some));
+  });
+
+  testWithoutContext('licensesAccepted works for no licenses accepted', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     processManager.processFactory = processMetaFactory(<String>[
       '[=======================================] 100% Computing updates...             ',
@@ -168,55 +182,78 @@ void main() {
       'Review licenses that have not been accepted (y/N)?',
     ]);
 
-    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator();
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
     final LicensesAccepted result = await licenseValidator.licensesAccepted;
-    expect(result, equals(LicensesAccepted.none));
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
 
-  testUsingContext('runLicenseManager succeeds for version >= 26', () async {
+    expect(result, equals(LicensesAccepted.none));
+  });
+
+  testWithoutContext('runLicenseManager succeeds for version >= 26', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     when(sdk.sdkManagerVersion).thenReturn('26.0.0');
 
-    expect(await AndroidLicenseValidator.runLicenseManager(), isTrue);
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
 
-  testUsingContext('runLicenseManager errors when sdkmanager is not found', () async {
+    expect(await licenseValidator.runLicenseManager(), isTrue);
+  });
+
+  testWithoutContext('runLicenseManager errors when sdkmanager is not found', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     processManager.canRunSucceeds = false;
 
-    expect(AndroidLicenseValidator.runLicenseManager(), throwsToolExit());
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
 
-  testUsingContext('runLicenseManager errors when sdkmanager fails to run', () async {
+    expect(licenseValidator.runLicenseManager(), throwsToolExit());
+  });
+
+  testWithoutContext('runLicenseManager errors when sdkmanager fails to run', () async {
     when(sdk.sdkManagerPath).thenReturn('/foo/bar/sdkmanager');
     processManager.runSucceeds = false;
 
-    expect(AndroidLicenseValidator.runLicenseManager(), throwsToolExit());
-  }, overrides: Map<Type, Generator>.unmodifiable(<Type, Generator>{
-    AndroidSdk: () => sdk,
-    FileSystem: () => fs,
-    ProcessManager: () => processManager,
-    Platform: () => FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-    Stdio: () => stdio,
-  }));
+    final AndroidLicenseValidator licenseValidator = AndroidLicenseValidator(
+      androidSdk: sdk,
+      fileSystem: fileSystem,
+      processManager: processManager,
+      platform: FakePlatform(environment: <String, String>{'HOME': '/home/me'}),
+      stdio: stdio,
+      logger: BufferLogger.test(),
+      userMessages: UserMessages(),
+      androidStudio: null,
+      operatingSystemUtils: FakeOperatingSystemUtils(),
+    );
+
+    expect(licenseValidator.runLicenseManager(), throwsToolExit());
+  });
 
   testWithoutContext('detects license-only SDK installation', () async {
     when(sdk.licensesAvailable).thenReturn(true);
@@ -224,16 +261,16 @@ void main() {
     final ValidationResult validationResult = await AndroidValidator(
       androidStudio: null,
       androidSdk: sdk,
-      fileSystem: fs,
+      fileSystem: fileSystem,
       logger: logger,
       processManager: processManager,
       platform: FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-      userMessages: userMessages,
+      userMessages: UserMessages(),
     ).validate();
     expect(validationResult.type, ValidationType.partial);
     expect(
       validationResult.messages.last.message,
-      userMessages.androidSdkLicenseOnly(kAndroidHome),
+      UserMessages().androidSdkLicenseOnly(kAndroidHome),
     );
   });
 
@@ -249,7 +286,7 @@ void main() {
     when(sdk.latestVersion).thenReturn(mockSdkVersion);
     when(sdk.validateSdkWellFormed()).thenReturn(<String>[]);
     when(processManager.runSync(<String>['which', 'java'])).thenReturn(ProcessResult(123, 1, '', ''));
-    final String errorMessage = userMessages.androidSdkBuildToolsOutdated(
+    final String errorMessage = UserMessages().androidSdkBuildToolsOutdated(
       sdk.sdkManagerPath,
       kAndroidSdkMinVersion,
       kAndroidSdkBuildToolsMinVersion.toString(),
@@ -259,11 +296,11 @@ void main() {
     final AndroidValidator androidValidator = AndroidValidator(
       androidStudio: null,
       androidSdk: sdk,
-      fileSystem: fs,
+      fileSystem: fileSystem,
       logger: logger,
       processManager: processManager,
       platform: FakePlatform()..environment = <String, String>{'HOME': '/home/me'},
-      userMessages: userMessages,
+      userMessages: UserMessages(),
     );
 
     ValidationResult validationResult = await androidValidator.validate();
@@ -313,16 +350,16 @@ void main() {
     const String javaVersionText = 'openjdk version "1.7.0_212"';
     when(processManager.run(argThat(contains('-version')))).thenAnswer((_) =>
       Future<ProcessResult>.value(ProcessResult(0, 0, null, javaVersionText)));
-    final String errorMessage = userMessages.androidJavaMinimumVersion(javaVersionText);
+    final String errorMessage = UserMessages().androidJavaMinimumVersion(javaVersionText);
 
     final ValidationResult validationResult = await AndroidValidator(
       androidSdk: sdk,
       androidStudio: null,
-      fileSystem: fs,
+      fileSystem: fileSystem,
       logger: logger,
       platform: FakePlatform()..environment = <String, String>{'HOME': '/home/me', 'JAVA_HOME': 'home/java'},
       processManager: processManager,
-      userMessages: userMessages,
+      userMessages: UserMessages(),
     ).validate();
     expect(validationResult.type, ValidationType.partial);
     expect(
@@ -341,12 +378,13 @@ void main() {
     final ValidationResult validationResult = await AndroidValidator(
       androidSdk: null,
       androidStudio: null,
-      fileSystem: fs,
+      fileSystem: fileSystem,
       logger: logger,
       platform: FakePlatform()..environment = <String, String>{'HOME': '/home/me', 'JAVA_HOME': 'home/java'},
       processManager: processManager,
-      userMessages: userMessages,
+      userMessages: UserMessages(),
     ).validate();
+
     expect(
       validationResult.messages.any(
         (ValidationMessage message) => message.message.contains('flutter config --android-sdk')