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.
Which values occur exactly three times?
Given an unsigned integer x, find the largest y by rearranging the bits in x
Sum the Digits of a Number
Twist 'n' Match
Is It a Snake?
Repopulate the City
Stuff the Board
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