Your test suite just checks whether a quadrilateral has equal sides, but that's not enough to form a square: rhombuses also have equal sides. Therefore, the test suite should also check a solution's angles.
PS: A test case filled with rhombuses and a single square on the curve would be instructional too.
Select every other element of a vector
Finding Perfect Squares
Back to basics 6 - Column Vector
middleAsColumn: Return all but first and last element as a column vector
Find the elements of a matrix according to a defined property.
Balanced Ternary Numbers: Easy as |, |-, |o
Simulate one complete step in the Biham–Middleton–Levine traffic model
Stuff the Board
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