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.
Twins in a Window
Return the Nth Output from an Input Command
Convert Roman to Arabic Numerals
Determine if input is a Narcissistic number
Spot the outlier
Formatting currency numbers
Find a subset that divides the vector into equal halves
Do the lines intersect?
Twist 'n' Match
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