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 a Palindrome Number
give nth decimal place of pi
How many trades represent all the profit?
Is this is a Tic Tac Toe X Win?
Find the Final State of an Abelian Sandpile
Balanced Ternary Numbers: Easy as |, |-, |o
Spot the outlier
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