Initial solution includes superfluous function.

Tests are using Test.expect.

Needs random tests

Not an issue

Not descriptive in its overall expectations

I've got a large amount of homework to do the next couple of weeks. After that I think I'll go ahead and try to tackle this.

Looks like the kata was abandoned. Jacobb maybe you can spruce it up a bit?

I'm hoping you haven't abandoned your kata. It's a nice level of challenge, but appears to be easily brute-forced to solve. You might be able to deliver dynamic argument names if you use the Function constructor method.

I enjoyed this kata. A few ideas for improvement:

• As others have said, the tests need a lot of elaboration to make this a worthwhile exercise, though.
• You could add function calls that have more parameters than the function was expecting to make sure the coder is paying attention.
• I would emphasise the optional when referring to the excluded keys.
• You shouldn't really have example code in the initial solution code. You've got it in the description and, if anything, it could go into the example test fixture instead.

Consider adding functions with different parameter names to the test cases. My solution would automatically fail