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?
Check to see if a Sudoku Puzzle is Solved
radius of a spherical planet
Sophie Germain prime
Determine if input is a Narcissistic number
Simulate one complete step in the Biham–Middleton–Levine traffic model
Formatting currency numbers
Count the Digits in the Box
Stuff the Board
The 17x17 Problem
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