1 files changed, 4 insertions, 0 deletions
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 7bdd8e9b0f..f2a0f19d16 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -1740,6 +1740,10 @@ EOT
         assert_equal(content[1].force_encoding("ascii-8bit"),
                      result.force_encoding("ascii-8bit"))
       end
+
+      bug3407 = '[ruby-core:30641]'
+      result = File.read('UTF-8-bom.txt', encoding: 'BOM|UTF-8')
+      assert_equal("a", result.force_encoding("ascii-8bit"), bug3407)
     }
   end