public void ShouldAcceptNegativeValue()
        {
            var message          = "Message";
            var name             = "Name";
            var consoleRender    = Substitute.For <IScreenManager>();
            var inputNumber      = new InputNumber(name, message, consoleRender);
            var aNegativeNumeric = "-94";

            var valid = inputNumber.IsValidAnswer(aNegativeNumeric);

            valid.Should().BeTrue();
        }
        public void ShouldNotAcceptAlphaValue()
        {
            var message       = "Message";
            var name          = "Name";
            var consoleRender = Substitute.For <IScreenManager>();
            var inputNumber   = new InputNumber(name, message, consoleRender);
            var aString       = "Answer";

            var valid = inputNumber.IsValidAnswer(aString);

            valid.Should().BeFalse();
        }