anchor.diff:   * calls.
    */
   void asyncTest(String spec, int callbacks, TestFunction body) {
  -  _ensureActiveSuite();
  +  _ensureInitialized();
   
     final testCase = new TestCase(
  -      _currentSuite._tests.length + 1, _fullSpec(spec), body, callbacks);
  -  _currentSuite._tests.add(testCase);
  +      _tests.length + 1, _fullSpec(spec), body, callbacks);
  +  _tests.add(testCase);
   
     if (callbacks < 1) {
       testCase.recordError(
  
positive.code:  * body of the function passed to this will inherit this group's description.
   */
  void group(String description, void body()) {
    _ensureActiveSuite();
  
    // Concatenate the new group.
    final oldGroup = _currentGroup;
  
negative.code:  * calls.
   */
  void test(String spec, TestFunction body) {
    _ensureInitialized();
  
    _tests.add(new TestCase(_tests.length + 1, _fullSpec(spec), body, 0));
  }
  
  /**
  