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 relatively common elements in matrix rows
Convert Roman to Arabic Numerals
Compute a dot product of two vectors x and y
String permutations on phone keyboard
Convex Hull Capture
How Many Months Until It's Today Again?
Remove the air bubbles
Twins in a Window
Rotate and display numbered tile
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