diff --git a/packages/flutter_tools/lib/executable.dart b/packages/flutter_tools/lib/executable.dart
index 5b8fc215ff..18c7881702 100644
--- a/packages/flutter_tools/lib/executable.dart
+++ b/packages/flutter_tools/lib/executable.dart
@@ -77,9 +77,8 @@ Future<void> main(List<String> args) async {
   final bool muteCommandLogging = (help || doctor) && !veryVerbose;
   final bool verboseHelp = help && verbose;
   final bool daemon = args.contains('daemon');
-  final bool machine = args.contains('--machine');
-  final bool runMachine = (machine && args.contains('run')) ||
-                          (machine && args.contains('attach'));
+  final bool runMachine = (args.contains('--machine') && args.contains('run')) ||
+                          (args.contains('--machine') && args.contains('attach'));
 
   // Cache.flutterRoot must be set early because other features use it (e.g.
   // enginePath's initializer uses it). This can only work with the real
@@ -123,11 +122,10 @@ Future<void> main(List<String> args) async {
         );
         return loggerFactory.createLogger(
           daemon: daemon,
-          runMachine: runMachine,
+          machine: runMachine,
           verbose: verbose && !muteCommandLogging,
           prefixedErrors: prefixedErrors,
           windows: globals.platform.isWindows,
-          machine: machine,
         );
       },
     },
@@ -228,10 +226,9 @@ class LoggerFactory {
   Logger createLogger({
     @required bool verbose,
     @required bool prefixedErrors,
-    @required bool runMachine,
+    @required bool machine,
     @required bool daemon,
     @required bool windows,
-    @required bool machine,
   }) {
     Logger logger;
     if (windows) {
@@ -240,15 +237,13 @@ class LoggerFactory {
         stdio: _stdio,
         outputPreferences: _outputPreferences,
         stopwatchFactory: _stopwatchFactory,
-        machine: machine,
       );
     } else {
       logger = StdoutLogger(
         terminal: _terminal,
         stdio: _stdio,
         outputPreferences: _outputPreferences,
-        stopwatchFactory: _stopwatchFactory,
-        machine: machine,
+        stopwatchFactory: _stopwatchFactory
       );
     }
     if (verbose) {
@@ -260,7 +255,7 @@ class LoggerFactory {
     if (daemon) {
       return NotifyingLogger(verbose: verbose, parent: logger);
     }
-    if (runMachine) {
+    if (machine) {
       return AppRunLogger(parent: logger);
     }
     return logger;
diff --git a/packages/flutter_tools/lib/runner.dart b/packages/flutter_tools/lib/runner.dart
index 40e9ad5d0e..4d3da3ada8 100644
--- a/packages/flutter_tools/lib/runner.dart
+++ b/packages/flutter_tools/lib/runner.dart
@@ -226,7 +226,6 @@ Future<String> _doctorText() async {
     final BufferLogger logger = BufferLogger(
       terminal: globals.terminal,
       outputPreferences: globals.outputPreferences,
-      machine: false,
     );
 
     final Doctor doctor = Doctor(logger: logger);
diff --git a/packages/flutter_tools/lib/src/base/logger.dart b/packages/flutter_tools/lib/src/base/logger.dart
index 32390d5e47..4c605b0ee3 100644
--- a/packages/flutter_tools/lib/src/base/logger.dart
+++ b/packages/flutter_tools/lib/src/base/logger.dart
@@ -36,12 +36,6 @@ abstract class Logger {
 
   bool get hasTerminal;
 
-  /// Whether the current flutter command invocation also contains a `--machine` flag.
-  ///
-  /// This should be used to elide output to stdout that is not formatted in newline
-  /// delimited JSON.
-  bool get machine;
-
   Terminal get terminal;
 
   OutputPreferences get _outputPreferences;
@@ -165,9 +159,6 @@ class DelegatingLogger implements Logger {
   @override
   bool get quiet => _delegate.quiet;
 
-  @override
-  bool get machine => _delegate.machine;
-
   @override
   set quiet(bool value) => _delegate.quiet = value;
 
@@ -278,7 +269,6 @@ class StdoutLogger extends Logger {
     required this.terminal,
     required Stdio stdio,
     required OutputPreferences outputPreferences,
-    required this.machine,
     StopwatchFactory stopwatchFactory = const StopwatchFactory(),
   })
     : _stdio = stdio,
@@ -289,8 +279,6 @@ class StdoutLogger extends Logger {
   final Terminal terminal;
   @override
   final OutputPreferences _outputPreferences;
-  @override
-  final bool machine;
   final Stdio _stdio;
   final StopwatchFactory _stopwatchFactory;
 
@@ -455,14 +443,12 @@ class WindowsStdoutLogger extends StdoutLogger {
     required Terminal terminal,
     required Stdio stdio,
     required OutputPreferences outputPreferences,
-    required bool machine,
     StopwatchFactory stopwatchFactory = const StopwatchFactory(),
   }) : super(
       terminal: terminal,
       stdio: stdio,
       outputPreferences: outputPreferences,
       stopwatchFactory: stopwatchFactory,
-      machine: machine,
     );
 
   @override
@@ -484,7 +470,6 @@ class BufferLogger extends Logger {
   BufferLogger({
     required this.terminal,
     required OutputPreferences outputPreferences,
-    this.machine = false,
     StopwatchFactory stopwatchFactory = const StopwatchFactory(),
   }) : _outputPreferences = outputPreferences,
        _stopwatchFactory = stopwatchFactory;
@@ -493,7 +478,6 @@ class BufferLogger extends Logger {
   BufferLogger.test({
     Terminal? terminal,
     OutputPreferences? outputPreferences,
-    this.machine = false,
   }) : terminal = terminal ?? Terminal.test(),
        _outputPreferences = outputPreferences ?? OutputPreferences.test(),
        _stopwatchFactory = const StopwatchFactory();
@@ -505,9 +489,6 @@ class BufferLogger extends Logger {
   @override
   final Terminal terminal;
 
-  @override
-  final bool machine;
-
   final StopwatchFactory _stopwatchFactory;
 
   @override
diff --git a/packages/flutter_tools/lib/src/context_runner.dart b/packages/flutter_tools/lib/src/context_runner.dart
index d7f7e09e29..d6724ef288 100644
--- a/packages/flutter_tools/lib/src/context_runner.dart
+++ b/packages/flutter_tools/lib/src/context_runner.dart
@@ -274,13 +274,11 @@ Future<T> runInContext<T>(
             terminal: globals.terminal,
             stdio: globals.stdio,
             outputPreferences: globals.outputPreferences,
-            machine: false,
           )
         : StdoutLogger(
             terminal: globals.terminal,
             stdio: globals.stdio,
             outputPreferences: globals.outputPreferences,
-            machine: false,
           ),
       MacOSWorkflow: () => MacOSWorkflow(
         featureFlags: featureFlags,
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
index c4f7f122e2..36d67c3ae4 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart
@@ -44,7 +44,7 @@ void main() {
     platform = const LocalPlatform();
     processManager = const LocalProcessManager();
     terminal = AnsiTerminal(platform: platform, stdio: Stdio());
-    logger = BufferLogger(outputPreferences: OutputPreferences.test(), terminal: terminal, machine: false);
+    logger = BufferLogger(outputPreferences: OutputPreferences.test(), terminal: terminal);
     tempDir = fileSystem.systemTempDirectory.createTempSync('flutter_analysis_test.');
   });
 
diff --git a/packages/flutter_tools/test/commands.shard/hermetic/attach_test.dart b/packages/flutter_tools/test/commands.shard/hermetic/attach_test.dart
index efe24031d6..6038585234 100644
--- a/packages/flutter_tools/test/commands.shard/hermetic/attach_test.dart
+++ b/packages/flutter_tools/test/commands.shard/hermetic/attach_test.dart
@@ -558,9 +558,6 @@ class StreamLogger extends Logger {
   @override
   bool get isVerbose => true;
 
-  @override
-  bool get machine => true;
-
   @override
   void printError(
     String message, {
diff --git a/packages/flutter_tools/test/general.shard/artifact_updater_test.dart b/packages/flutter_tools/test/general.shard/artifact_updater_test.dart
index 1b6c883a71..6a3f56ded7 100644
--- a/packages/flutter_tools/test/general.shard/artifact_updater_test.dart
+++ b/packages/flutter_tools/test/general.shard/artifact_updater_test.dart
@@ -186,7 +186,6 @@ void main() {
       terminal: Terminal.test(supportsColor: true),
       stdio: FakeStdio(),
       outputPreferences: OutputPreferences.test(),
-      machine: false,
     );
     final ArtifactUpdater artifactUpdater = ArtifactUpdater(
       fileSystem: fileSystem,
diff --git a/packages/flutter_tools/test/general.shard/base/logger_test.dart b/packages/flutter_tools/test/general.shard/base/logger_test.dart
index 2bad8708a4..a4c404af58 100644
--- a/packages/flutter_tools/test/general.shard/base/logger_test.dart
+++ b/packages/flutter_tools/test/general.shard/base/logger_test.dart
@@ -26,7 +26,7 @@ final String resetBold = RegExp.escape(AnsiTerminal.resetBold);
 final String resetColor = RegExp.escape(AnsiTerminal.resetColor);
 
 void main() {
-  testWithoutContext('correct logger instance is created with machine: false', () {
+  testWithoutContext('correct logger instance is created', () {
     final LoggerFactory loggerFactory = LoggerFactory(
       terminal: Terminal.test(),
       stdio: FakeStdio(),
@@ -36,124 +36,52 @@ void main() {
     expect(loggerFactory.createLogger(
       verbose: false,
       prefixedErrors: false,
-      runMachine: false,
+      machine: false,
       daemon: false,
       windows: false,
-      machine: false
-    ), isA<StdoutLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<StdoutLogger>());
     expect(loggerFactory.createLogger(
       verbose: false,
       prefixedErrors: false,
-      runMachine: false,
+      machine: false,
       daemon: false,
       windows: true,
-      machine: false
-    ), isA<WindowsStdoutLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<WindowsStdoutLogger>());
     expect(loggerFactory.createLogger(
       verbose: true,
       prefixedErrors: false,
-      runMachine: false,
+      machine: false,
       daemon: false,
       windows: true,
-      machine: false
-    ), isA<VerboseLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<VerboseLogger>());
     expect(loggerFactory.createLogger(
       verbose: true,
       prefixedErrors: false,
-      runMachine: false,
+      machine: false,
       daemon: false,
       windows: false,
-      machine: false
-    ), isA<VerboseLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<VerboseLogger>());
     expect(loggerFactory.createLogger(
       verbose: false,
       prefixedErrors: true,
-      runMachine: false,
+      machine: false,
       daemon: false,
       windows: false,
-      machine: false
-    ), isA<PrefixedErrorLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<PrefixedErrorLogger>());
     expect(loggerFactory.createLogger(
       verbose: false,
       prefixedErrors: false,
-      runMachine: false,
+      machine: false,
       daemon: true,
       windows: false,
-      machine: false
-    ), isA<NotifyingLogger>().having((Logger logger) => logger.machine, 'machine', false));
+    ), isA<NotifyingLogger>());
     expect(loggerFactory.createLogger(
       verbose: false,
       prefixedErrors: false,
-      runMachine: true,
+      machine: true,
       daemon: false,
       windows: false,
-      machine: false
-    ), isA<AppRunLogger>().having((Logger logger) => logger.machine, 'machine', false));
-  });
-
-  testWithoutContext('correct logger instance is created with machine: true', () {
-    final LoggerFactory loggerFactory = LoggerFactory(
-      terminal: Terminal.test(),
-      stdio: FakeStdio(),
-      outputPreferences: OutputPreferences.test(),
-    );
-
-    expect(loggerFactory.createLogger(
-      verbose: false,
-      prefixedErrors: false,
-      runMachine: false,
-      daemon: false,
-      windows: false,
-      machine: true
-    ), isA<StdoutLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: false,
-      prefixedErrors: false,
-      runMachine: false,
-      daemon: false,
-      windows: true,
-      machine: true
-    ), isA<WindowsStdoutLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: true,
-      prefixedErrors: false,
-      runMachine: false,
-      daemon: false,
-      windows: true,
-      machine: true
-    ), isA<VerboseLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: true,
-      prefixedErrors: false,
-      runMachine: false,
-      daemon: false,
-      windows: false,
-      machine: true
-    ), isA<VerboseLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: false,
-      prefixedErrors: true,
-      runMachine: false,
-      daemon: false,
-      windows: false,
-      machine: true
-    ), isA<PrefixedErrorLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: false,
-      prefixedErrors: false,
-      runMachine: false,
-      daemon: true,
-      windows: false,
-      machine: true
-    ), isA<NotifyingLogger>().having((Logger logger) => logger.machine, 'machine', true));
-    expect(loggerFactory.createLogger(
-      verbose: false,
-      prefixedErrors: false,
-      runMachine: true,
-      daemon: false,
-      windows: false,
-      machine: true
-    ), isA<AppRunLogger>().having((Logger logger) => logger.machine, 'machine', true));
+    ), isA<AppRunLogger>());
   });
 
   testWithoutContext('WindowsStdoutLogger rewrites emojis when terminal does not support emoji', () {
@@ -162,7 +90,6 @@ void main() {
       outputPreferences: OutputPreferences.test(),
       stdio: stdio,
       terminal: Terminal.test(supportsColor: false, supportsEmoji: false),
-      machine: false,
     );
 
     logger.printStatus('🔥🖼️✗✓🔨💪✏️');
@@ -176,7 +103,6 @@ void main() {
       outputPreferences: OutputPreferences.test(),
       stdio: stdio,
       terminal: Terminal.test(supportsColor: true, supportsEmoji: true),
-      machine: false,
     );
 
     logger.printStatus('🔥🖼️✗✓🔨💪✏️');
@@ -369,7 +295,6 @@ void main() {
       ),
       stdio: stdio,
       outputPreferences: OutputPreferences.test(),
-      machine: false,
     );
 
     logger.printStatus('message');
@@ -387,7 +312,6 @@ void main() {
       ),
       stdio: stdio,
       outputPreferences: OutputPreferences.test(),
-      machine: false,
     );
     logger.printStatus('message');
     logger.printError('error message');
@@ -407,7 +331,6 @@ void main() {
       ),
       stdio: stdio,
       outputPreferences: OutputPreferences.test(),
-      machine: false,
     );
     logger.printStatus('message');
     logger.printError('error message');
@@ -538,7 +461,6 @@ void main() {
             stdio: mockStdio,
             outputPreferences: OutputPreferences.test(showColor: true),
             stopwatchFactory: stopwatchFactory,
-            machine: false,
           );
           final Status status = logger.startProgress(
             'Hello',
@@ -576,7 +498,6 @@ void main() {
               stdio: mockStdio,
               outputPreferences: OutputPreferences.test(showColor: true),
               stopwatchFactory: stopwatchFactory,
-              machine: false,
             );
             const String message = "Knock Knock, Who's There";
             final Status status = logger.startProgress(
@@ -618,7 +539,6 @@ void main() {
               stdio: mockStdio,
               outputPreferences: OutputPreferences.test(showColor: true),
               stopwatchFactory: stopwatchFactory,
-              machine: false,
             );
             const String message = "Knock Knock, Who's There";
             final Status status = logger.startProgress(
@@ -751,7 +671,6 @@ void main() {
         ),
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
-        machine: false,
       );
       logger.printError('0123456789' * 15);
       final List<String> lines = outputStderr();
@@ -780,7 +699,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
       );
       logger.printError('0123456789' * 15, indent: 5);
@@ -804,7 +722,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
       );
       logger.printError('0123456789' * 15, hangingIndent: 5);
@@ -828,7 +745,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
       );
       logger.printError('0123456789' * 15, indent: 4, hangingIndent: 5);
@@ -852,7 +768,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
       );
       logger.printStatus('0123456789' * 15);
@@ -874,7 +789,6 @@ void main() {
         ),
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
-        machine: false,
       );
       logger.printStatus('0123456789' * 15, indent: 5);
       final List<String> lines = outputStdout();
@@ -897,7 +811,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false)
       );
       logger.printStatus('0123456789' * 15, hangingIndent: 5);
@@ -921,7 +834,6 @@ void main() {
           platform: _kNoAnsiPlatform,
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40, showColor: false),
       );
       logger.printStatus('0123456789' * 15, indent: 4, hangingIndent: 5);
@@ -945,7 +857,6 @@ void main() {
           platform: FakePlatform(stdoutSupportsAnsi: true),
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences: OutputPreferences.test(showColor: true),
       );
       logger.printError('Pants on fire!');
@@ -963,7 +874,6 @@ void main() {
           platform: FakePlatform(),
         ),
         stdio: fakeStdio,
-        machine: false,
         outputPreferences:  OutputPreferences.test(showColor: true),
       );
       logger.printStatus('All good.');
@@ -982,7 +892,6 @@ void main() {
         ),
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(showColor: true),
-        machine: false,
       );
       logger.printStatus(
         null,
@@ -1006,7 +915,6 @@ void main() {
         ),
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(showColor: false),
-        machine: false,
       );
       logger.printStatus(
         null,
@@ -1031,7 +939,6 @@ void main() {
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(showColor: false),
         stopwatchFactory: FakeStopwatchFactory(stopwatch: fakeStopwatch),
-        machine: false,
       );
       final Status status = logger.startProgress(
         'Hello',
@@ -1101,7 +1008,6 @@ void main() {
         ),
         stdio: fakeStdio,
         outputPreferences: OutputPreferences.test(showColor: false),
-        machine: false,
       );
       logger.startProgress('AAA').stop();
       logger.startProgress('BBB').stop();
@@ -1125,7 +1031,6 @@ void main() {
           ),
           stdio: fakeStdio,
           outputPreferences: OutputPreferences.test(),
-          machine: false,
         ),
         stopwatchFactory: FakeStopwatchFactory(),
       );
diff --git a/packages/flutter_tools/test/general.shard/base/terminal_test.dart b/packages/flutter_tools/test/general.shard/base/terminal_test.dart
index 490d2ecf35..7ba6d4ad7e 100644
--- a/packages/flutter_tools/test/general.shard/base/terminal_test.dart
+++ b/packages/flutter_tools/test/general.shard/base/terminal_test.dart
@@ -16,7 +16,6 @@ void main() {
       final BufferLogger bufferLogger = BufferLogger(
         outputPreferences: OutputPreferences.test(wrapText: true, wrapColumn: 40),
         terminal: TestTerminal(platform: FakePlatform()..stdoutSupportsAnsi = true),
-        machine: false,
       );
       bufferLogger.printStatus('0123456789' * 8);
 
@@ -27,7 +26,6 @@ void main() {
       final BufferLogger bufferLogger = BufferLogger(
         outputPreferences: OutputPreferences.test(wrapText: false),
         terminal: TestTerminal(platform: FakePlatform()..stdoutSupportsAnsi = true),
-        machine: false,
       );
       final String testString = '0123456789' * 20;
       bufferLogger.printStatus(testString);
@@ -126,7 +124,6 @@ void main() {
       final BufferLogger bufferLogger = BufferLogger(
         terminal: terminalUnderTest,
         outputPreferences: OutputPreferences.test(),
-        machine: false,
       );
       terminalUnderTest.usesTerminalUi = true;
       mockStdInStream = Stream<String>.fromFutures(<Future<String>>[
@@ -151,7 +148,6 @@ void main() {
       final BufferLogger bufferLogger = BufferLogger(
         terminal: terminalUnderTest,
         outputPreferences: OutputPreferences.test(),
-        machine: false,
       );
       terminalUnderTest.usesTerminalUi = true;
       mockStdInStream = Stream<String>.fromFutures(<Future<String>>[
diff --git a/packages/flutter_tools/test/general.shard/migrations/cmake_project_migration_test.dart b/packages/flutter_tools/test/general.shard/migrations/cmake_project_migration_test.dart
index 83e2aee502..88f148f121 100644
--- a/packages/flutter_tools/test/general.shard/migrations/cmake_project_migration_test.dart
+++ b/packages/flutter_tools/test/general.shard/migrations/cmake_project_migration_test.dart
@@ -40,7 +40,6 @@ void main () {
         testLogger = BufferLogger(
           terminal: Terminal.test(),
           outputPreferences: OutputPreferences.test(),
-          machine: false,
         );
 
         mockCmakeProject = FakeCmakeProject(managedCmakeFile);
diff --git a/packages/flutter_tools/test/integration.shard/downgrade_upgrade_integration_test.dart b/packages/flutter_tools/test/integration.shard/downgrade_upgrade_integration_test.dart
index 891410a416..ea7d48eeb1 100644
--- a/packages/flutter_tools/test/integration.shard/downgrade_upgrade_integration_test.dart
+++ b/packages/flutter_tools/test/integration.shard/downgrade_upgrade_integration_test.dart
@@ -24,7 +24,6 @@ final ProcessUtils processUtils = ProcessUtils(processManager: processManager, l
   ),
   stdio: stdio,
   outputPreferences: OutputPreferences.test(wrapText: true),
-  machine: false,
 ));
 final String flutterBin = fileSystem.path.join(getFlutterRoot(), 'bin', platform.isWindows ? 'flutter.bat' : 'flutter');
 
diff --git a/packages/flutter_tools/test/src/testbed.dart b/packages/flutter_tools/test/src/testbed.dart
index 93dd37959a..710fe1619c 100644
--- a/packages/flutter_tools/test/src/testbed.dart
+++ b/packages/flutter_tools/test/src/testbed.dart
@@ -38,7 +38,6 @@ final Map<Type, Generator> _testbedDefaults = <Type, Generator>{
   Logger: () => BufferLogger(
     terminal: AnsiTerminal(stdio: globals.stdio, platform: globals.platform), // Danger, using real stdio.
     outputPreferences: OutputPreferences.test(),
-    machine: false,
   ), // Allows reading logs and prevents stdout.
   OperatingSystemUtils: () => FakeOperatingSystemUtils(),
   OutputPreferences: () => OutputPreferences.test(), // configures BufferLogger to avoid color codes.