pkg/test: handle symlinked dart executable

lib/src/util/io.dart

Index: lib/src/util/io.dart
diff --git a/lib/src/util/io.dart b/lib/src/util/io.dart
index 50b142413292c37baa874425b1bf3c35aa31a15f..b66e41cfd8ad4cf98b09942c8ea5a3bc5efefbce 100644
--- a/lib/src/util/io.dart
+++ b/lib/src/util/io.dart
@@ -21,8 +21,11 @@ const _newline = 0xA;
 const _carriageReturn = 0xD;
 
 /// The root directory of the Dart SDK.
-final String sdkDir =
-    p.dirname(p.dirname(Platform.executable));
+final String sdkDir = (() {
+  // TODO(kevmoo): work-around for accessing the SDK root dartbug.com/16994
+  var path = new File(Platform.executable).resolveSymbolicLinksSync();
+  return p.dirname(p.dirname(path));
+})();
 
 /// The version of the Dart SDK currently in use.
 final Version _sdkVersion = new Version.parse(