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.
Angle of triangle
Sort numbers by outside digits
Spherical radius given four points
Give a matrix that matches itself when rotated
Beads on a Necklace (Convex Hulls)
Balanced Ternary Numbers: Easy as |, |-, |o
Twist 'n' Match
How long is the longest prime diagonal?
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