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.
Flip the main diagonal of a matrix
Longest run of consecutive numbers
Create an 'arrow-head" matrix
Beads on a Necklace (Convex Hulls)
Encoding Google Maps Polylines
Spot the rectangle (Part 2)
Spot the outlier
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