Improve refer test.
Improve refer test.

lexmag/elixir,pedrosnk/elixir,gfvcastro/elixir,antipax/elixir,beedub/elixir,ggcampinho/elixir,kimshrier/elixir,lexmag/elixir,kelvinst/elixir,pedrosnk/elixir,kelvinst/elixir,ggcampinho/elixir,joshprice/elixir,antipax/elixir,beedub/elixir,michalmuskala/elixir,kimshrier/elixir,gfvcastro/elixir,elixir-lang/elixir