Insufficient number of non-random tests.

;)

Insufficient number of non-random tests.

don't worry, he'll get banned for this.

You can check by yourself, each row and column and 3x3 sub-square should have values from 1 to 9 without duplicates or zeros.

false is correct result for this input.

each column, each row, and each of the nine 3x3 sub-grids (also known as blocks) contain all of the digits from 1 to 9.

No, false is the right result.

I'm not sure what you mean, but the expected result is false, and that is correct.

Nothing can be done about it.