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.
Word Counting and Indexing
Read a Soroban Abacus
Return the Nth Output from an Input Command
Spot the First Occurrence of 5
Twins in a Window
Twist 'n' Match
Beads on a Necklace (Convex Hulls)
How Many Months Until It's Today Again?
Simulate one complete step in the Biham–Middleton–Levine traffic model
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