same problem...
/e
solved it!
thanks for test cases :)

I don't get the logic of third test. Why [-1] instead of [-1,0]?

Different stack sizes?

I have the same issue, how you solve?

You can console.log the argument and it will show in the output.

No it's not an inside joke, but it is a joke. If you solve the kata you'll see what I mean.

I can't edit it anymore, here are more descriptive tests

Test.expect(arraysEqual(Array.range(0,0), []), 'A count of 0 should make an empty array')
Test.expect(arraysEqual(Array.range(0,1), [0]), 'A count of 1 should make an array with 1')
Test.expect(arraysEqual(Array.range(-1,1), [-1]), 'The array's first value should begin with start (aka range(-1,1) should return [-1])')
Test.expect(arraysEqual(Array.range(1,1), [1]), 'The array's first value should begin with start (aka range(1,1) should return [1]')
Test.expect(arraysEqual(Array.range(-1,3), [-1,0,1]), 'Testing count (aka range(-1,3) should be [-1,0,1])')
Test.expect([].sum() == 0, 'empty array should sum to 0')
Test.expect([0, 1, 2].sum() == 3, '[0,1,2] should equal 3')
Test.expect([-1, 0, 1].sum() == 0, 'Adding negative numbers')
Test.expect([1, 2, 3].sum() == 6, '[1,2,3] should equal 6')