Fix BF Exact Change Tests

[ltegman]

Added a test case for when the smallest denomination of change available is larger than the total change required.

Closes #1409

[ahstro]

Thank you for this, but you need to add a large value as well, e.g. ONE HUNDRED, to make sure that the code written says Insufficient Funds even if there is enough money, just not enough change.

[ltegman]

The test case I included should only return .5 of change and the available dollar in the drawer is valued at 1.00 so I think this should correctly test the case where the value of the total change is high enough but the denomination is too high and should return Insufficient Funds. I'm happy to change the case though if you think that's not correct.

[ahstro]

Oh, duh, my brain is apparenlty mush. My code worked, but I didn't think it was supposed to.. Let me do some more testing.

[ahstro]

Didn't expect my old code to work, I guess I just wrote better code than I though back when I solved this. Thank you :)