Trouble making an argument optional

[linuxnoob]

I think you accidentally saved a second version of your file or something. Works fine for me.

Output:
..
----------------------------------------------------------------------
Ran 2 tests in 0.011s

OK

DING DING DING!!! Nailed it! I misspelled the file earlier, fixed it and forget that the old misspelled one was still hanging around. I've been beating my head against the wall on this for awhile. Thanks!