 
     # Start the app and configure ExUnit with command line options
     # before requiring test_helper.exs so that the configuration is
-    # available in test_helper.exs. Then configure ExUnit again so
-    # that command line options override test_helper.exs
+    # available in test_helper.exs
     Mix.shell().print_app
     app_start_args = if opts[:slowest], do: ["--preload-modules" | args], else: args
     Mix.Task.run("app.start", app_start_args)

    * `--only` - runs only tests that match the filter
    * `--preload-modules` - preloads all modules defined in applications
    * `--raise` - raises if the test suite failed
    * `--seed` - seeds the random number generator used to randomize tests order;
      `--seed 0` disables randomization
    * `--slowest` - prints timing information for the N slowest tests.
      Automatically sets `--trace` and `--preload-modules`


  The `:test_coverage` configuration accepts the following options:

    * `:output` - the output directory for cover results. Defaults to `"cover"`
    * `:tool` - the coverage tool
    * `:summary` - summary output configuration; can be either a boolean
      or a keyword list. When a keyword list is passed, it can specify a `:threshold`,
      which is a boolean or numeric value that enables coloring of code coverage
      results in red or green depending on whether the percentage is below or
      above the specified threshold, respectively. Defaults to `[threshold: 90]`

  By default, a very simple wrapper around OTP's `cover` is used as a tool,
  but it can be overridden as follows:
