1 files changed, 9 insertions, 2 deletions
diff --git a/test/openssl/test_buffering.rb b/test/openssl/test_buffering.rb
index c85a6f020b..7575c5b4fe 100644
--- a/test/openssl/test_buffering.rb
+++ b/test/openssl/test_buffering.rb
@@ -1,4 +1,4 @@
-# frozen_string_literal: false
+# frozen_string_literal: true
 require_relative 'utils'
 
 if defined?(OpenSSL)
@@ -10,7 +10,7 @@ class OpenSSL::TestBuffering < OpenSSL::TestCase
     attr_accessor :sync
 
     def initialize
-      @io = ""
+      @io = Buffer.new
       def @io.sync
         true
       end
@@ -41,6 +41,13 @@ class OpenSSL::TestBuffering < OpenSSL::TestCase
     @io = IO.new
   end
 
+  def test_encoding
+    @io.write '😊'
+    @io.flush
+
+    assert_equal @io.string.encoding, Encoding::BINARY
+  end
+
   def test_flush
     @io.write 'a'