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.
Remove the vowels
Sorted highest to lowest?
Back to basics 9 - Indexed References
N-Dimensional Array Slice
Spot the outlier
How Many Months Until It's Today Again?
Simulate one complete step in the Biham–Middleton–Levine traffic model
Crossing to Kissing - Untangle the Lines
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