Revert "Only lookup `config.log_level` for stdlib `::Logger`. Closes #11665."

This reverts commit e0a521cfcd13e4d1f0ae8ab96004289e1c020f71.

Conflicts:
	railties/CHANGELOG.md

We expect loggers to quack like stdlib logger. If log4r needs different
level= assignment, using a Logger-quacking wrapper is the way to do it.

Fixes #14114.

1 files changed, 1 insertions, 14 deletions

diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index b2d0e7e202..b39cd3747b 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -762,7 +762,7 @@ module ApplicationTests
       end
     end
 
-    test "lookup config.log_level with custom logger (stdlib Logger)" do
+    test "config.log_level with custom logger" do
       make_basic_app do |app|
         app.config.logger = Logger.new(STDOUT)
         app.config.log_level = :info
@@ -770,19 +770,6 @@ module ApplicationTests
       assert_equal Logger::INFO, Rails.logger.level
     end
 
-    test "assign log_level as is with custom logger (third party logger)" do
-      logger_class = Class.new do
-        attr_accessor :level
-      end
-      logger_instance = logger_class.new
-      make_basic_app do |app|
-        app.config.logger = logger_instance
-        app.config.log_level = :info
-      end
-      assert_equal logger_instance, Rails.logger
-      assert_equal :info, Rails.logger.level
-    end
-
     test "respond_to? accepts include_private" do
       make_basic_app