public void GivenNullFirstNameAndValidLastName_WhenTurnNullToEmptyString_ShouldReturnFirstNameAsEmptyStringAndLastName()
        {
            //Setup
            string firstName = null;
            string lastName  = "Smith";

            //Act
            GetValidInputService vS = new GetValidInputService();

            vS.TurnNullToEmptyString(ref firstName, ref lastName);

            //Assert
            firstName.ShouldBe("");
            firstName.ShouldNotBe(null);
            lastName.ShouldBe("Smith");
            lastName.ShouldNotBe("");
        }
        public void GivenValidFirstNameAndLastName_WhenTurnNullToEmptyString_ShouldReturnValidFirstNameandLastName()
        {
            //Setup
            var firstName = "John";
            var lastName  = "Smith";

            //Act
            GetValidInputService vS = new GetValidInputService();

            vS.TurnNullToEmptyString(ref firstName, ref lastName);

            //Assert
            firstName.ShouldBe("John");
            lastName.ShouldBe("Smith");
            firstName.ShouldNotBe("");
            lastName.ShouldNotBe("");
        }