Log doesn't print when running "mix test" - testing

Question

I'm trying to debug while a test is not running, I have my test and I'm trying to print something so I can see the values of a tuple when mix test is run. I've tried doing this:
require Logger
test "creates element", %{conn: conn} do
Logger.debug "debugging #{inspect conn}"
conn = post conn, v1_content_path(conn, :create), content: #valid_attrs
...
...
end
But nothing is printed! It's driving me nuts!
Here is where I read to do what I'm doing How to pretty print conn content?
Edit Also tried with:
IO.puts "debugging #{inspect conn}"
Edit Here the contents of my test_helper.exs
ExUnit.start
Mix.Task.run "ecto.create", ~w(-r TestApp.Repo --quiet)
Mix.Task.run "ecto.migrate", ~w(-r TestApp.Repo --quiet)
Ecto.Adapters.SQL.begin_test_transaction(TestApp.Repo)
Edit Here my whole testing file:
defmodule TestApp.ContentControllerTest do
require Logger
use TestApp.ConnCase
#valid_attrs %{title: "Content Title", url: "http://www.content.com"}
#invalid_attrs %{}
setup %{conn: conn} do
conn
|> put_req_header("accept", "application/json")
{:ok, conn: conn}
end
test "my first test", %{conn: conn} do
Logger.debug "debugging #{inspect conn}"
end
end
Edit Here is the detail of mix test:
$ mix test
.
Finished in 2.5 seconds (0.6s on load, 1.9s on tests)
1 tests, 0 failures
Randomized with seed 685273

Answer 1

compile_time_purge_level
As pointed out in some comments to your question, the compile_time_purge_level can be reduced to the :debug level for the test environment by changing the :logger config in config/test.exs.
test.exs
config :logger,
backends: [:console],
compile_time_purge_level: :debug
run tests again
mix test