public void Message_SomeException_RuntimeErrorMessage()
 {
     var innerException = new Exception("Some error");
     var exception = new RuntimeCalculatorException(innerException);
     Assert.That(exception.Message, Is.EqualTo("Runtime exception: Some error."));
 }
 public void InnerException_SomeException_Same()
 {
     var innerException = new Exception("Some error");
     var exception = new RuntimeCalculatorException(innerException);
     Assert.That(exception.InnerException, Is.SameAs(innerException));
 }