Tests 9, 10 and 11

I add the test 9 = IX. It fails. I make it work by adding another ifelse, just like the 4. Can’t see any way to refactor it.
I add the test 10 = X. It fails. Again I add it as another ifelse, just like the 4 and 9.

Public Function i2r(i As Integer) As String

Application.Volatile

i2r = ""

If i = 4 Then

i2r = "IV"

ElseIf i = 9 Then

i2r = "IX"

ElseIf i = 10 Then

i2r = "X"

ElseIf i >= 5 Then

i2r = "V"

i = i - 5

End If

While i <= 3 And i > 0

i2r = i2r + "I"

i = i - 1

Wend

End Function

As I add the test 11 = XI, I notice the i following the x and I think about the 12 and 13. This looks like it’s the good old repeating “I” situation.

I’m tempted to add the 12 and 13 test cases in too, but I decided not to. Why? After all, it seems easy enough to do, but then I’d move into trying to make 3 tests work at once and although they’d probably work I suspect that it’s not the intention of TDD. And besides, it is easy enough to add the 12 and 13 in afterwards.

I make the 11 test work very easily