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.
Remove the small words from a list of words.
Number of Horns on a unicorn!
Volume difference between Ellipsoid and Sphere
Return 'on' or 'off'
Placing Beads Neatly in a Box
Balanced Ternary Numbers: Easy as |, |-, |o
How Many Months Until It's Today Again?
When Was That Goal Scored?
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