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
Project Euler: Problem 5, Smallest multiple
Generate pi using logarithm
Insert zeros into vector
Moving average (variable kernel length)
Fix the last element of a cell array
Crossing to Kissing - Untangle the Lines
When Was That Goal Scored?
Simulate one complete step in the Biham–Middleton–Levine traffic model
Count the Digits in the Box
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