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 common elements in matrix rows
Bottles of beer
Surface Fit z(x,y)
Converting Decimal to Binary
Twist 'n' Match
Convert hex color specification to MATLAB RGB
Count the Digits in the Box
Find the stride of the longest skip sequence
Give a matrix that matches itself when rotated
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