A minimal status file formatter and canonicalizer.

pkg/status_file/lib/expectation.dart

Index: pkg/status_file/lib/expectation.dart
diff --git a/pkg/status_file/lib/expectation.dart b/pkg/status_file/lib/expectation.dart
index 58cc0da466cd1fd736a09da18f4430d4b50a776d..5e9dd542545ed7cb2aa6697e9c1508017e0c0509 100644
--- a/pkg/status_file/lib/expectation.dart
+++ b/pkg/status_file/lib/expectation.dart
@@ -106,7 +106,7 @@ class Expectation {
   // static error should be reported. It leads to perpetually larger status
   // files and means a reader of a test can't tell what the intended behavior
   // actually is without knowing which status files mention it. Remove.
-  static final Expectation ok = new Expectation._('Ok', isMeta: true);
+  static final Expectation ok = new Expectation._('OK', isMeta: true);
 
   /// A marker that indicates the test takes longer to complete than most tests.
   /// Tells the test runner to increase the timeout when running it.