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.
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Determine Whether an array is empty
Magic is simple (for beginners)
Say something funny
Breaking Bad Tiles (Spelling with Element Symbols)
Twins in a Window
Find the biggest empty box
Would Homer Like It?
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