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.
Remove the vowels
Who knows the last digit of pi?
Find files with extension ext in the current directory
Calculate the Hamming distance between two strings
Detect a number and replace with two NaN's
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Find a subset that divides the vector into equal halves
Remove the air bubbles
Find the stride of the longest skip sequence
Simulate one complete step in the Biham–Middleton–Levine traffic model
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