It is not called "unit matrix" but "identity matrix" in English.
You need multiple tests to check a variety of situations.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
improve test suite
Flip the main diagonal of a matrix
Find the nearest integer
Who invented zero?
Square the input
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