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.
Replace NaNs with the number that appears to its left in the row.
Clockwise or Counterclockwise
Number of Circles in a Number
Top of the Hour : Return from your routine within 1 second of the hour
Would Homer Like It?
Rotate and display numbered tile
Repopulate the City
Spot the outlier
When Was That Goal Scored?
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