anchor.diff:      expect(_hasMember(e6, n1), isTrue);
     }
   
  +  /// Test the convenience constructors (binary, auto-wrapping).
     void convenienceBinaryCreation() {
       // Test Expression creation with convenience constructors.
       List<BinaryOperator> binOps = [new Times('x', 2), 
  
positive.code:     }
    }
    
    void simpleIntervalCreation() {
      _createBasicExpressions(interval);
  
  
negative.code:     'Expression VECTOR Creation': simpleVectorCreation,
      'Binary Op Convenience Creation': convenienceBinaryCreation,
      'Unary Op Convenience Creation': convenienceUnaryCreation,
      'Operator simplification': baseOperatorSimplification,
      'Simple REAL evaluation': simpleRealEval,
      'Simple INTERVAL evaluation': simpleIntervalEval,
      'Simple VECTOR evaluation': simpleVectorEval,
      'Default Function Creation': defFuncCreation,
      'Default Function simplification': defFuncSimplification,
      'Default Function differentiation': defFuncDifferentiation,
      'Default Function REAL evaluation': defFuncRealEval,
      'Default Function INTERVAL evaluation': defFuncIntervalEval,
      'Default Function VECTOR evaluation': defFuncVectorEval,
  