Test engine version hash, but skip for Dart HHH bot (#55223)

dev/bots/run_command.dart

@@ -80,7 +80,7 @@ Future<void> runCommand(String executable, List<String> arguments, {
   );
 
   final String commandDescription = '${path.relative(executable, from: workingDirectory)} ${arguments.join(' ')}';
-  final String relativeWorkingDir = path.relative(workingDirectory);
+  final String relativeWorkingDir = path.relative(workingDirectory ?? Directory.current.path);
   if (skip) {
     printProgress('SKIPPING', relativeWorkingDir, commandDescription);
     return;

dev/bots/test.dart

@@ -28,12 +28,26 @@ typedef ShardRunner = Future<void> Function();
 /// appropriate error message.
 typedef OutputChecker = String Function(CapturedOutput);
 
+final String exe = Platform.isWindows ? '.exe' : '';
+final String bat = Platform.isWindows ? '.bat' : '';
 final String flutterRoot = path.dirname(path.dirname(path.dirname(path.fromUri(Platform.script))));
-final String flutter = path.join(flutterRoot, 'bin', Platform.isWindows ? 'flutter.bat' : 'flutter');
-final String dart = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'dart.exe' : 'dart');
-final String pub = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', Platform.isWindows ? 'pub.bat' : 'pub');
+final String flutter = path.join(flutterRoot, 'bin', 'flutter$bat');
+final String dart = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', 'dart$exe');
+final String pub = path.join(flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', 'pub$bat');
 final String pubCache = path.join(flutterRoot, '.pub-cache');
 final String toolRoot = path.join(flutterRoot, 'packages', 'flutter_tools');
+final String engineVersionFile = path.join(flutterRoot, 'bin', 'internal', 'engine.version');
+
+String get platformFolderName {
+  if (Platform.isWindows)
+    return 'windows-x64';
+  if (Platform.isMacOS)
+    return 'darwin-x64';
+  if (Platform.isLinux)
+    return 'linux-x64';
+  throw UnsupportedError('The platform ${Platform.operatingSystem} is not supported by this script.');
+}
+final String flutterTester = path.join(flutterRoot, 'bin', 'cache', 'artifacts', 'engine', platformFolderName, 'flutter_tester$exe');
 
 /// The arguments to pass to `flutter test` (typically the local engine
 /// configuration) -- prefilled with the arguments passed to test.dart.
@@ -118,8 +132,37 @@ Future<void> main(List<String> args) async {
   print('$clock ${bold}Test successful.$reset');
 }
 
+/// Verify the Flutter Engine is the revision in
+/// bin/cache/internal/engine.version.
+Future<void> _validateEngineHash() async {
+  final String luciBotId = Platform.environment['SWARMING_BOT_ID'] ?? '';
+  if (luciBotId.startsWith('luci-dart-')) {
+    // The Dart HHH bots intentionally modify the local artifact cache
+    // and then use this script to run Flutter's test suites.
+    // Because the artifacts have been changed, this particular test will return
+    // a false positive and should be skipped.
+    print('${yellow}Skipping Flutter Engine Version Validation for swarming '
+          'bot $luciBotId.');
+    return;
+  }
+  final String expectedVersion = File(engineVersionFile).readAsStringSync().trim();
+  final CapturedOutput flutterTesterOutput = CapturedOutput();
+  await runCommand(flutterTester, <String>['--help'], output: flutterTesterOutput, outputMode: OutputMode.capture);
+  final String actualVersion = flutterTesterOutput.stderr.split('\n').firstWhere((final String line) {
+    return line.startsWith('Flutter Engine Version:');
+  });
+  if (!actualVersion.contains(expectedVersion)) {
+    print('${red}Expected "Flutter Engine Version: $expectedVersion", '
+          'but found "$actualVersion".');
+    exit(1);
+  }
+}
+
 Future<void> _runSmokeTests() async {
   print('${green}Running smoketests...$reset');
+
+  await _validateEngineHash();
+
   // Verify that the tests actually return failure on failure and success on
   // success.
   final String automatedTests = path.join(flutterRoot, 'dev', 'automated_tests');
@@ -1249,7 +1292,6 @@ int get prNumber {
 }
 
 Future<String> _getAuthors() async {
-  final String exe = Platform.isWindows ? '.exe' : '';
   final String author = await runAndGetStdout(
     'git$exe', <String>['-c', 'log.showSignature=false', 'log', gitHash, '--pretty="%an <%ae>"'],
     workingDirectory: flutterRoot,

dev/bots/utils.dart

@@ -12,7 +12,7 @@ final bool hasColor = stdout.supportsAnsiEscapes;
 final String bold = hasColor ? '\x1B[1m' : ''; // used for shard titles
 final String red = hasColor ? '\x1B[31m' : ''; // used for errors
 final String green = hasColor ? '\x1B[32m' : ''; // used for section titles, commands
-final String yellow = hasColor ? '\x1B[33m' : ''; // unused
+final String yellow = hasColor ? '\x1B[33m' : ''; // used for skips
 final String cyan = hasColor ? '\x1B[36m' : ''; // used for paths
 final String reverse = hasColor ? '\x1B[7m' : ''; // used for clocks
 final String reset = hasColor ? '\x1B[0m' : '';