1 files changed, 32 insertions, 0 deletions
diff --git a/test/logger/test_severity.rb b/test/logger/test_severity.rb
index dad63472a6..e1069c8262 100644
--- a/test/logger/test_severity.rb
+++ b/test/logger/test_severity.rb
@@ -3,6 +3,8 @@
 require 'logger'
 
 class TestLoggerSeverity < Test::Unit::TestCase
+  include Logger::Severity
+
   def test_enum
     logger_levels = Logger.constants
     levels = ["WARN", "UNKNOWN", "INFO", "FATAL", "DEBUG", "ERROR"]
@@ -23,4 +25,34 @@ class TestLoggerSeverity < Test::Unit::TestCase
       assert(logger.level) == Logger::Severity.const_get(level)
     end
   end
+
+  def test_thread_local_level
+    logger = Logger.new(nil)
+    logger.level = INFO # default level
+    other = Logger.new(nil)
+    other.level = ERROR # default level
+
+    assert_equal(other.level, ERROR)
+    logger.with_level(:WARN) do
+      assert_equal(other.level, ERROR)
+      assert_equal(logger.level, WARN)
+
+      logger.with_level(DEBUG) do # verify reentrancy
+        assert_equal(logger.level, DEBUG)
+
+        Thread.new do
+          assert_equal(logger.level, INFO)
+          logger.with_level(:WARN) do
+            assert_equal(other.level, ERROR)
+            assert_equal(logger.level, WARN)
+          end
+          assert_equal(logger.level, INFO)
+        end.join
+
+        assert_equal(logger.level, DEBUG)
+      end
+      assert_equal(logger.level, WARN)
+    end
+    assert_equal(logger.level, INFO)
+  end
 end