Ensure newline at EOF in RubyMine

Question

How does one enforce a newline at end of file in RubyMine (v 4.5.3, on Mac OS)?
e.g., similar to Sublime Text 2

Answer 1

Enable Ensure blank line before end of file on Save option in the Editor settings:

Answer 2

In RubyMine 6 or above (on Mac OSX):

Enable 'Ensure line feed at file end on Save' option in the Editor settings.

Answer 3

RubyMine 2021.2

"Ensure every saved file ends with a line break"