Mention mix and testing conventions in ExUnit's doc
Mention mix and testing conventions in ExUnit's doc

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