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.
Add two numbers
Sum all integers from 1 to 2^n
Center of mass
Cell Counting: How Many Draws?
Put two time series onto the same time basis
Stuff the Board
Formatting currency numbers
The 17x17 Problem
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