[ruby/logger] Let File::NULL ("/dev/null", "NUL" etc.) be considered a nil log device

https://github.com/ruby/logger/commit/b42a1b99aa

1 files changed, 5 insertions, 0 deletions

diff --git a/test/logger/test_logger.rb b/test/logger/test_logger.rb
index 521b5627d4..f8cc2e5bd6 100644
--- a/test/logger/test_logger.rb
+++ b/test/logger/test_logger.rb
@@ -378,4 +378,9 @@ class TestLogger < Test::Unit::TestCase
     log = log(logger, :debug) { "msg" }
     assert_nil log.msg
   end
+
+  def test_does_not_instantiate_log_device_for_File_NULL
+    l = Logger.new(File::NULL)
+    assert_nil(l.instance_variable_get(:@logdev))
+  end
 end