Re-enable codesign integration test (#85507)

dev/conductor/lib/codesign.dart

@@ -284,7 +284,7 @@ class CodesignCommand extends Command<void> {
     // First print all deviations from expectations
     if (unsignedBinaries.isNotEmpty) {
       stdio.printError('Found ${unsignedBinaries.length} unsigned binaries:');
-      unsignedBinaries.forEach(print);
+      unsignedBinaries.forEach(stdio.printError);
     }
 
     if (wrongEntitlementBinaries.isNotEmpty) {

dev/conductor/lib/globals.dart

@@ -50,23 +50,7 @@ Directory get localFlutterRoot {
   const FileSystem fileSystem = LocalFileSystem();
   const Platform platform = LocalPlatform();
 
-  // If a test
-  if (platform.script.scheme == 'data') {
-    final RegExp pattern = RegExp(
-      r'(file:\/\/[^"]*[/\\]dev\/conductor[/\\][^"]+\.dart)',
-      multiLine: true,
-    );
-    final Match? match =
-        pattern.firstMatch(Uri.decodeFull(platform.script.path));
-    if (match == null) {
-      throw Exception(
-        'Cannot determine path of script!\n${platform.script.path}',
-      );
-    }
-    filePath = Uri.parse(match.group(1)!).path.replaceAll(r'%20', ' ');
-  } else {
-    filePath = platform.script.toFilePath();
-  }
+  filePath = platform.script.toFilePath();
   final String checkoutsDirname = fileSystem.path.normalize(
     fileSystem.path.join(
       fileSystem.path.dirname(filePath),

dev/conductor/test/codesign_integration_test.dart

@@ -31,9 +31,13 @@ void main() {
       stdio: stdio,
     );
 
+    final Directory flutterRoot = _flutterRootFromDartBinary(
+      fileSystem.file(platform.executable),
+    );
+
     final CommandRunner<void> runner = CommandRunner<void>('codesign-test', '')
       ..addCommand(
-          CodesignCommand(checkouts: checkouts, flutterRoot: localFlutterRoot));
+          CodesignCommand(checkouts: checkouts, flutterRoot: flutterRoot));
 
     try {
       await runner.run(<String>[
@@ -44,7 +48,7 @@ void main() {
       ]);
     } on ConductorException catch (e) {
       print(stdio.error);
-      print(fixItInstructions);
+      print(_fixItInstructions);
       fail(e.message);
     } on Exception {
       print('stdout:\n${stdio.stdout}');
@@ -54,10 +58,17 @@ void main() {
   }, onPlatform: <String, dynamic>{
     'windows': const Skip('codesign command is only supported on macos'),
     'linux': const Skip('codesign command is only supported on macos'),
-  }, skip: 'TODO(christopherfujino): https://github.com/flutter/flutter/issues/83448');
+  });
+}
+
+Directory _flutterRootFromDartBinary(File dartBinary) {
+  final Directory flutterDartSdkDir = dartBinary.parent.parent;
+  final Directory flutterCache = flutterDartSdkDir.parent;
+  final Directory flutterSdkDir = flutterCache.parent.parent;
+  return flutterSdkDir;
 }
 
-const String fixItInstructions = '''
+const String _fixItInstructions = '''
 Codesign integration test failed.
 
 This means that the binary files found in the Flutter cache do not match those