Remove :console backend from app env in Mix tests (#8432)

Backends added or removed dynamically via Logger.add_backend/2 or
Logger.remove_backend/2 are not persisted. Backends must be
removed from the application environment explicitly.

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/mix/test/test_helper.exs b/lib/mix/test/test_helper.exs
index ce182fd91..5c6ebea96 100644
--- a/lib/mix/test/test_helper.exs
+++ b/lib/mix/test/test_helper.exs
@@ -34,6 +34,7 @@ defmodule MixTest.Case do
   setup config do
     if apps = config[:apps] do
       Logger.remove_backend(:console)
+      Application.put_env(:logger, :backends, [])
     end
 
     on_exit(fn ->
@@ -52,6 +53,7 @@ defmodule MixTest.Case do
         end
 
         Logger.add_backend(:console, flush: true)
+        Application.put_env(:logger, :backends, [:console])
       end
     end)