Fix issue 2933 - if an exception is thrown before we start the first test, but after the testcase i…

pkg/unittest/test_case.dart

Index: pkg/unittest/test_case.dart
===================================================================
--- pkg/unittest/test_case.dart	(revision 11963)
+++ pkg/unittest/test_case.dart	(working copy)
@@ -56,6 +56,8 @@
 
   bool enabled = true;
 
+  bool running = false;
+
   bool _doneTeardown = false;
 
   TestCase(this.id, this.description, this.test,
@@ -68,6 +70,7 @@
 
   void run() {
     if (enabled) {
+      running = true;
       result = stackTrace = null;
       message = '';
       _doneTeardown = false;
@@ -94,6 +97,7 @@
       }
       _doneTeardown = true;
     }
+    running = false;
     _config.onTestResult(this);
   }