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.
Find the sum of the elements in the "second" diagonal
Angle between two vectors
Find the largest value in the 3D matrix
Find Index of maximum Value and maximum Value of a vector
Simulate one complete step in the Biham–Middleton–Levine traffic model
Spot the outlier
Find the Next Legal Move in Reversi
Spot the rectangle
Find the biggest empty box
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