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.
Reverse Run-Length Encoder
Decode a simplified barcode
Duplicate each element of a vector.
Find the biggest empty box
Make a run-length companion vector
Spot the rectangle (Part 2)
Is this group simply connected?
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