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.
Determine whether a vector is monotonically increasing
Volume of a Parallelepiped
Find Index of maximum Value and maximum Value of a vector
When can one be the Life Member of the IEEE?
Spot the rectangle (Part 2)
Frobenius McNugget Factorization
Repopulate the City
Twist 'n' Match
Rotate and display numbered tile
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