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.
Summing Digits within Text
Distance walked 1D
Rotate input square matrix 90 degrees CCW without rot90
Elastic Collision 001: 1-D
Spot the rectangle (Part 2)
Find the stride of the longest skip sequence
Cell Counting: How Many Draws?
Put two time series onto the same time basis
Find the Final State of an Abelian Sandpile
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