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.
Make an N-dimensional Multiplication Table
Back to basics 25 - Valid variable names
Determine Whether an array is empty
The Answer to Life, the Universe, and Everything
2048 Next Move
Count the Digits in the Box
Find the biggest empty box
The 17x17 Problem
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