Running mix tasks "silently" so nothing is logged to stdout?

Questions / Help
,
1

I’ve got a couple custom mix tasks that I call during various setup stages of my tests. Is there a way to run them so the info messages that they print to stdout are not returned?

2

Can you give an example of what is happening?

3

Sure – some of my test modules use setup_all to refresh the database via some mix tasks, e.g.

defmodule MyApp.SomethingTest do
  use ExUnit.Case

  setup_all do
    # Reset the database
    Mix.Task.run("mongo.drop")
    Mix.Task.run("mongo.index")

    :ok
  end

  # ... tests follow ...

When I run mix test, I see in the logs all the messages output by the mix tasks, e.g. from Mix.shell().info("Mongo database dropped.")

I would prefer to execute those tasks “silently” so their messages don’t pollute the output of the test run.

4

You can change the current Mix.shell() before running the commands.

5

Is this what you meant? Something like this?

  setup_all do
    shell = Mix.shell()
    Mix.shell(Mix.Shell.Quiet)
    Mix.Task.run("noisy.task")
    Mix.shell(shell) # <-- return to previous shell
    :ok
  end