Add tests for match arg.
Add tests for match arg.

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