public void TestHandleFloatNumberNotOperator()
        {
            //arrange
            JsonRequest request = new JsonRequest {
                Input = "5", calculatorState = new JsonResponse {
                    IsOperator = false, IsMinus = true, Display = "-", State = "-"
                }
            };

            //act
            JsonResponse response = request.HandleFloatNumber(null);

            //assert
            response.Display.Should().Be("-5");
            response.IsMinus.Should().Be(false);
            response.IsOperator.Should().Be(false);
        }