   end
 
   @doc """
-  Starts up ExUnit and automatically set it up to run
-  tests at the VM exit. It accepts a set of options to
+  Starts up ExUnit and automatically runs
+  tests when the VM exits. It accepts a set of options to
   configure `ExUnit` (the same ones accepted by `configure/1`).
 
-  In case you want to run tests manually, skip calling this
+  If you want to run tests manually, skip calling this
   function and rely on `configure/1` and `run/0` instead.
   """
   def start(options // []) do

      end

  To run the test above, all you need to do is to run the file
  using elixir from command line. Assuming you named your file
  assertion_test.exs, you can run it as:

      bin/elixir assertion_test.exs


  * `:max_cases` - Maximum number of cases to run in parallel.
                   Defaults to `:erlang.system_info(:schedulers_online)`;

  * `:trace` - Set ExUnit into trace mode, this sets `:max_cases` to 1
               and prints each test case and test while running;

  """
