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.
Connect Four Win Checker
Number of 1s in the Binary Representation of a Number
Arrange Vector in descending order
Back to basics 21 - Matrix replicating
Find the nearest prime number
Stuff the Board
Would Homer Like It?
Count the Digits in the Box
Find the biggest empty box
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