Some minor small fixes to unittest

pkg/unittest/lib/src/config.dart

Index: pkg/unittest/lib/src/config.dart
diff --git a/pkg/unittest/lib/src/config.dart b/pkg/unittest/lib/src/config.dart
index 85398ae497af9ac5b4c091b1913f746464393ebc..7a39743919f0810c2958765482f8d0118cff9139 100644
--- a/pkg/unittest/lib/src/config.dart
+++ b/pkg/unittest/lib/src/config.dart
@@ -129,11 +129,11 @@ class Configuration {
       print('$passed PASSED, $failed FAILED, $errors ERRORS');
     }
 
-    _receivePort.close();
     if (success) {
       _postMessage('unittest-suite-success');
       _receivePort.close();
     } else {
+      _receivePort.close();
       throw new Exception('Some tests failed.');
     }
   }