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.
Function composition - harder
Generate N equally spaced intervals between -L and L
5 Prime Numbers
Is It a Snake?
The 17x17 Problem
Crossing to Kissing - Untangle the Lines
Find the Next Legal Move in Reversi
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