anchor.diff:    int failed = 0;
     int errors = 0;
   
  -  for (TestCase t in _testCases) {
  +  for (TestCase t in testCases) {
       switch (t.result) {
         case PASS:  passed++; break;
         case FAIL:  failed++; break;
  
positive.code:  */
  void test(String spec, TestFunction body) {
    ensureInitialized();
    _testCases.add(new TestCase._internal(_testCases.length + 1, _fullSpec(spec),
                                          body));
  }
  
  /**
  
negative.code: 
  /** [TestCase] currently being executed. */
  TestCase get currentTestCase =>
      (_currentTestCaseIndex >= 0 && _currentTestCaseIndex < testCases.length)
          ? testCases[_currentTestCaseIndex]
          : null;
  
  /** Whether the framework is in an initialized state. */
  