• No sample tests
• Bad formatting of initial solution
• No information on a unit of the angle
• Formula seems to be wrong for angles above 170 degrees
• Tests use strict euality for returned angles
• The invalid cases do not really make sense. Returning an empty array on an invalid input makes even less sense. Do we even need tests for n < 3?

I will unpublish the kata so you can fix the issues. Feel free to republish after problems are fixed.