Don't resolve symlinks on Windows to find the SDK.

Platform.executable doesn't include the ".exe" extension on Windows,
which causes symlink resolution for it to fail.

Closes #133

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1165313002.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed10922..a5ffccb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.12.3+1
+
+* Fix a bug that caused the test runner to crash on Windows because symlink
+  resolution failed.
+
 ## 0.12.3
 
 * If a future matched against the `completes` or `completion()` matcher throws
diff --git a/lib/src/util/io.dart b/lib/src/util/io.dart
index b66e41c..896a740 100644
--- a/lib/src/util/io.dart
+++ b/lib/src/util/io.dart
@@ -23,7 +23,12 @@
 /// The root directory of the Dart SDK.
 final String sdkDir = (() {
   // TODO(kevmoo): work-around for accessing the SDK root dartbug.com/16994
-  var path = new File(Platform.executable).resolveSymbolicLinksSync();
+  //
+  // Don't resolve symlinks on Windows because of issue 133. Once the TODO above
+  // is resolved, we won't have to do explicit symlink resolution anyway.
+  var path = Platform.isWindows
+      ? Platform.executable
+      : new File(Platform.executable).resolveSymbolicLinksSync();
   return p.dirname(p.dirname(path));
 })();
 
diff --git a/pubspec.yaml b/pubspec.yaml
index ba6da81..92a6b7b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.3
+version: 0.12.3+1
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test