In the Haskell Sample Test "should perform many-to-many JOIN and apply WHERE" a comparison without spaces is present. The EBNF-scheme therefor is not exactly correct, but imho this is not a big problem.

comparison = " = " | " > " | " < " | " <= " | " >= " | " <> " ;
but in random tests for the comparison mask there are maybe no spaces

Note says - from top to bottom and from left to right
in cake: [.o....o.\n.o....o.\n........\no..oo..o\n]
expected: [".o..\n","..o.\n",".o..\n","..o.\n","..\no.\n","..\n.o\n","..\no.\n","..\n.o\n"]
but got: [".o..\n",".o..\n","..\no.\n","..\n.o\n","..o.\n","..o.\n","..\no.\n","..\n.o\n"]
but the rule - from left to right and from top to bottom

Same issue, (Haskell) solution is fast and seems correct. Full test suite hangs with no apparent reason after "Long properties / test lists of 0's, 1's, 2's, 3's, 4's, 5's, 6's, 7's, 8's and 9's". Everything's green up to the timeout.
I tried to check for long lists but they are no longer than 6 or 7 elements.
Did you figure it out?

Example Tests: Completed in 0.0054 seconds

Example Tests: +
[2147483647,2147483647,2147483647,2147483647]
[625703,43898,614961,448629]
Completed in 0.0062 seconds

but ATTEMPT throws me a 12000ms timeout error!

language Haskell GHC 7.10.3

I redid the solution, on basic tests it is 10 times slower, but the ATTEMPT passed.
Maybe there is a check with an INFINITE list.

This is hard to believe but in Python the initial list CANNOT be changed, it will be used when passing to the testing function.