ignore trailing whitespace in polymer transform test

pkg/polymer/test/transform/common.dart

Index: pkg/polymer/test/transform/common.dart
diff --git a/pkg/polymer/test/transform/common.dart b/pkg/polymer/test/transform/common.dart
index f1d85000ab052c0f4d795ab71162d85bac4dfdaa..db9032bf85b9bc07610ae73111c2b8ecc09984d3 100644
--- a/pkg/polymer/test/transform/common.dart
+++ b/pkg/polymer/test/transform/common.dart
@@ -16,6 +16,10 @@ AssetId idFromString(String s) {
   return new AssetId(s.substring(0, index), s.substring(index + 1));
 }
 
+String _removeTrailingWhitespace(String str) =>
+    str.splitMapJoin('\n',
+        onNonMatch: (s) => s.replaceAll(new RegExp(r'\s+$'), ''));

[Jennifer Messerly, 2013/09/06 01:36:08]

Dart doesn't have a trimEnd, as far as I can tell.

+
 /**
  * A helper package provider that has files stored in memory, also wraps
  * [Barback] to simply our tests.
@@ -74,6 +78,8 @@ class TestHelper implements PackageProvider {
 
   Future check(String assetIdString, String content) {
     return this[assetIdString].then((value) {
+      value = _removeTrailingWhitespace(value);
+      content = _removeTrailingWhitespace(content);
       expect(value, content, reason: 'Final output of $assetIdString differs.');
     });
   }