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.
Find state names that end with the letter A
Math with Roman Numerals
Getting the absolute index from a matrix
When Was That Goal Scored?
Twins in a Window
2048 Next Move
Make a function that returns its own character count
Spot the outlier
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