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.
Project Euler: Problem 7, Nth prime
Maintain shape of logical-index mask
Back to basics 21 - Matrix replicating
Create a random logical vector of N elements of which M are true.
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Spot the rectangle (Part 2)
Formatting currency numbers
How long is the longest prime diagonal?
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