Fix some dumb test-breaking errors.

pkg/scheduled_test/test/descriptor_test.dart

Index: pkg/scheduled_test/test/descriptor_test.dart
diff --git a/pkg/scheduled_test/test/descriptor_test.dart b/pkg/scheduled_test/test/descriptor_test.dart
index abc0761e436e83eec07371308b4a8e24cc439018..1ece013921ee15da55f49a39c6a65267d7defaf2 100644
--- a/pkg/scheduled_test/test/descriptor_test.dart
+++ b/pkg/scheduled_test/test/descriptor_test.dart
@@ -732,7 +732,7 @@ void main() {
       ]);
 
       expect(dir.load('subdir').toList(),
-          throwsA(equals("Can't load the contents of 'subdir': is a "
+          throwsA(equals("Can't read the contents of 'subdir': is a "
               "directory.")));
     });
   });