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.
Finding Perfect Squares
Distance walked 1D
Get the length of a given vector
Create incremental spiral WITHOUT USING EVAL or FEVAL
Create a random logical vector of N elements of which M are true.
Find the Final State of an Abelian Sandpile
Find the biggest empty box
Is this group simply connected?
Placing Beads Neatly in a Box
Spot the outlier
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