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.
Tell me the slope
Maintain shape of logical-index mask
QWERTY Shift Encoder
Detect a number and replace with two NaN's
Infinite precision division
Crossing to Kissing - Untangle the Lines
Stuff the Board
Is It a Snake?
Put two time series onto the same time basis
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