No random tests in C# (similar issues in JS except usage of test.expect....)

Completely broken (JS), everything returns :

Unspecified AssertionError

• Tests should be upgraded to use Test.assertEquals, instead of the current Test.expect (and without a custom failure message!)
• Sample tests should cover a full range of cases: hex colors with digits A-F, multiple colors, etc.
• Randomized assertions should be added to the submit tests
• Description should make it absolutely clear that the resulting string must be in uppercase

Especially the last point, considering the amount of time I wasted trying to figure out why the heck I was getting "unspecified assertion error".

The requirement of the kata is MASSIVELY unclear, and the obscured test cases don't help at all either.

• What exactly are we trying to match? For example: |: DFxBC :|. I tried many things and the test case just keep telling me "you're wrong". This isn't helpful at all.
• Example test cases are woefully inadequate as well. It tells us nothing about how to handle anything beyond ABCDEFG.
• Is it seriously needed to obscure the test cases? Can't you just, you know, implement random test cases?

Please revise the description, and add more example test cases and random tests.

My code is passing everything except the last test case. This has been driving me mad, could someone tell me what the test case is, so I can finally solve this! please. Edit: I'm using Javascript.