private static string ExtractOperator(BinaryExpression binary)
{
string op = Regex.Match(binary.ToString(), " (==|=|!=|<=|>=|<|>) ").Groups[1].Value;
if (op == "==" ||op =="=")
return "should equal";
if (op == "!=")
return "should not equal";
if (op == "<=")
return "should be less than or equal to";
if (op == "<")
return "should be less than";
if (op == ">=")
return "should be greater than or equal to";
if (op == ">")
return "should be greater than";
return "should " + op;
}