Clear up MIX_ENV env variable before tests, closes #8584
Clear up MIX_ENV env variable before tests, closes #8584

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