Based on the code you've presented, I believe the problem has to do with the doublequotes you're using. Right now, you are using some kind of slanted quotes, which, if I copy and paste it and use that same definition myself in a test module, it generates the same error.
You want to make sure for your doublequotes that you use "normal" ones:
"
(ASCII 34) instead of ”
, which is unicode.
So change
-include_lib(“eunit/include/eunit.hrl”).
to
-include_lib("eunit/include/eunit.hrl").