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.
Times 2 - START HERE
Find last non-zero in a given dimension
N-Dimensional Array Slice
Create a square matrix of multiples
Spherical radius given four points
Count the Digits in the Box
2048 Next Move
Crossing to Kissing - Untangle the Lines
Determine the Result of a Move in Reversi
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