Revise several already-committed CLs.

pkg/barback/test/package_graph/repetition_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library barback.test.package_graph.transform_test;
 
 import 'package:barback/src/utils.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../utils.dart';
 
+// This tests the behavior of barback under many operations happening in quick
+// succession. Since Barback is so asynchronous, it's easy for it to have subtle
+// dependencies on the commonly-used and -tested usage patterns. These tests
+// exist to stress-test less-common usage patterns in order to root out
+// additional bugs.
+
 main() {
   initConfig();
 
   test("updates sources many times", () {
     initGraph(["app|foo.txt"], {
       "app": [[new RewriteTransformer("txt", "out")]]
     });
 
     for (var i = 0; i < 1000; i++) {
       updateSources(["app|foo.txt"]);
@@ skipping 16 matching lines @@
     expectNoAsset("app|foo.out");
     expectNoAsset("app|foo.txt");
     buildShouldSucceed();
   });
 
   test("updates transformers many times", () {
     var rewrite = new RewriteTransformer("txt", "out");
     initGraph(["app|foo.txt"], {"app": [[rewrite]]});
     updateSources(["app|foo.txt"]);
 
-    for (var i = 0; i < 1; i++) {
+    for (var i = 0; i < 1000; i++) {
       updateTransformers("app", [[rewrite]]);
     }
 
     expectAsset("app|foo.out", "foo.out");
     buildShouldSucceed();
   });
 
   test("updates and removes transformers many times", () {
     var rewrite = new RewriteTransformer("txt", "out");
     initGraph(["app|foo.txt"], {"app": [[rewrite]]});
     updateSources(["app|foo.txt"]);
 
-    for (var i = 0; i < 1; i++) {
+    for (var i = 0; i < 1000; i++) {
       updateTransformers("app", [[rewrite]]);
       updateTransformers("app", [[]]);
     }
 
     expectAsset("app|foo.txt", "foo");
     expectNoAsset("app|foo.out");
     buildShouldSucceed();
   });
 }