It is 3, its about how many times you do the operation, not what the actual result is. So for 39 you do 3 * 9 = 27, 2 * 7 = 14, 1 * 4 = 4, 4 is a single digit, and you had to perform 3 operations to get to a single digit answer, so your answer is 3 operations. It confused me too.

so the instructions says 39 should return 4;
39 = 27 27 = 14 1*4 = 4 but the unit test for 39 is saying 4 should equal 3

in your solution you can just encapsulate it and call where you want to

I tried your solution: no error in attempting or testing...

Im getting a parse error for Test1() when attempting but not when testing