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.
Make a Palindrome Number
Find last non-zero in a given dimension
Wind outward from the center ...
Duplicate each element of a vector.
Breaking Bad Tiles (Spelling with Element Symbols)
Rotate and display numbered tile
Make a run-length companion vector
Spot the rectangle
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