2 files changed, 26 insertions, 0 deletions
diff --git a/test/logger/test_logdevice.rb b/test/logger/test_logdevice.rb
index 72802f690d..40f646d855 100644
--- a/test/logger/test_logdevice.rb
+++ b/test/logger/test_logdevice.rb
@@ -45,6 +45,7 @@ class TestLogDevice < Test::Unit::TestCase
     begin
       assert_file.exist?(@filename)
       assert_predicate(logdev.dev, :sync)
+      refute_predicate(logdev.dev, :binmode?)
       assert_equal(@filename, logdev.filename)
       logdev.write('hello')
     ensure
@@ -53,6 +54,8 @@ class TestLogDevice < Test::Unit::TestCase
     # create logfile whitch is already exist.
     logdev = d(@filename)
     begin
+      assert_predicate(logdev.dev, :sync)
+      refute_predicate(logdev.dev, :binmode?)
       logdev.write('world')
       logfile = File.read(@filename)
       assert_equal(2, logfile.split(/\n/).size)
diff --git a/test/logger/test_logger.rb b/test/logger/test_logger.rb
index 5806e0c685..029203877a 100644
--- a/test/logger/test_logger.rb
+++ b/test/logger/test_logger.rb
@@ -240,6 +240,29 @@ class TestLogger < Test::Unit::TestCase
     assert_equal("false\n", log.msg)
   end
 
+  def test_add_binary_data_with_binmode_logdev
+    EnvUtil.with_default_internal(Encoding::UTF_8) do
+      begin
+        tempfile = Tempfile.new("logger")
+        tempfile.close
+        filename = tempfile.path
+        File.unlink(filename)
+
+        logger = Logger.new filename, binmode: true
+        logger.level = Logger::DEBUG
+
+        str = +"\x80"
+        str.force_encoding("ASCII-8BIT")
+
+        logger.add Logger::DEBUG, str
+        assert_equal(2, File.binread(filename).split(/\n/).size)
+      ensure
+        logger.close
+        tempfile.unlink
+      end
+    end
+  end
+
   def test_level_log
     logger = Logger.new(nil)
     logger.progname = "my_progname"