Got it, yeah, one extra at the end. Thanks.

Very likely it's the line ending that you have. I will add this note to all tests.

What am I doing wrong here?

Output:
Should return single square for size of 1 and should be a red square.
Expected: [r]
, instead got: [r]
Should return alternating squares.
Expected: [r][b]
[b][r]
, instead got: [r][b]
[b][r]

Expected: [r][b][r]
[b][r][b]
[r][b][r]
, instead got: [r][b][r]
[b][r][b]
[r][b][r]