the "sorted" requirement is problematic, I would suggest you drop this requirement and simply resort the output of cubicFormula after (not before) rounding to four digits (and apply the same logic to your testsuite)...
is there maybe a several problem with the sorting method you describe/need?? :-/
The problem requires abs as 'ComparisonMethod' for sorting and the non-conjugate transpose. That's a pain that I have just become aware: ' is the conjugate transpose, and .' is the non-conjugate transpose. The conjugate operator changes the signs of complex roots.
Summing Digits within Text
Connect Four Win Checker
Reindex a vector
Matrix to column conversion
Side of an equilateral triangle
Simple Caesar Cypher - shift encrypt a message given an index number
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