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.
Tic Tac Toe FTW
Given an unsigned integer x, find the largest y by rearranging the bits in x
Given a window, how many subsets of a vector sum positive
Count up then down
Find a subset that divides the vector into equal halves
Fix the last element of a cell array
Spot the rectangle (Part 2)
Twins in a Window
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