format parameter list (#27261)

diff --git a/packages/flutter_tools/test/flutter_manifest_test.dart b/packages/flutter_tools/test/flutter_manifest_test.dart
index 424c9da..b4f4508 100644
--- a/packages/flutter_tools/test/flutter_manifest_test.dart
+++ b/packages/flutter_tools/test/flutter_manifest_test.dart
@@ -494,8 +494,11 @@
       expect(flutterManifest.isEmpty, false);
     }
 
-    void testUsingContextAndFs(String description, FileSystem filesystem,
-        dynamic testMethod()) {
+    void testUsingContextAndFs(
+      String description,
+      FileSystem filesystem,
+      dynamic testMethod(),
+    ) {
       testUsingContext(description,
               () async {
             writeEmptySchemaFile(filesystem);