flutter test: (includes patch) experimental faster testing - support for paths with '-' character and also workspaces #168657

diff --git a/packages/flutter_tools/lib/src/test/runner.dart b/packages/flutter_tools/lib/src/test/runner.dart
index 49f9d5846c..e71b47586a 100644
--- a/packages/flutter_tools/lib/src/test/runner.dart
+++ b/packages/flutter_tools/lib/src/test/runner.dart
@@ -187,6 +187,31 @@ interface class FlutterTestRunner {
     }
   }
 
+  static PackageConfig _findPackageConfig({
+    required FlutterProject flutterProject
+  }) {
+    String path = flutterProject.directory.path;
+    while (path.isNotEmpty) {
+      final File projectPackageConfigFile = globals.fs
+        .directory(path)
+        .childDirectory('.dart_tool')
+        .childFile('package_config.json');
+
+      if (projectPackageConfigFile.existsSync()) {
+        print("package_config.json was found in ${path}");
+
+        return PackageConfig.parseBytes(
+          projectPackageConfigFile.readAsBytesSync(),
+          projectPackageConfigFile.uri,
+        );
+      }
+      List<String> parts = path.split("/");
+      parts.removeLast();
+      path = parts.join("/");
+    }
+    throw Exception("package_config.json not found");
+  }
+
   // To compile root_test_isolate_spawner.dart and
   // child_test_isolate_spawner.dart successfully, we will need to pass a
   // package_config.json to the frontend server that contains the
@@ -196,14 +221,7 @@ interface class FlutterTestRunner {
     required FlutterProject flutterProject,
     required File isolateSpawningTesterPackageConfigFile,
   }) async {
-    final File projectPackageConfigFile = globals.fs
-        .directory(flutterProject.directory.path)
-        .childDirectory('.dart_tool')
-        .childFile('package_config.json');
-    final PackageConfig projectPackageConfig = PackageConfig.parseBytes(
-      projectPackageConfigFile.readAsBytesSync(),
-      projectPackageConfigFile.uri,
-    );
+    final PackageConfig projectPackageConfig = _findPackageConfig(flutterProject: flutterProject);
 
     // The flutter_tools package_config.json is guaranteed to include
     // package:ffi and package:test_core.
@@ -259,6 +277,7 @@ import 'package:test_api/backend.dart'; // flutter_ignore: test_api_import
           .replaceAll('.', '_')
           .replaceAll(':', '_')
           .replaceAll('/', '_')
+          .replaceAll('-', '_')
           .replaceAll(r'\', '_')
           .replaceRange(path.length - '.dart'.length, null, '');
     }
@@ -480,6 +499,7 @@ String pathToImport(String path) {
       .replaceAll('.', '_')
       .replaceAll(':', '_')
       .replaceAll('/', '_')
+      .replaceAll('-', '_')
       .replaceAll(r'\', '_');
 }