1 files changed, 10 insertions, 0 deletions
diff --git a/test/rdoc/test_rdoc_parser.rb b/test/rdoc/test_rdoc_parser.rb
index b9bff9c327..cbc3dab9ea 100644
--- a/test/rdoc/test_rdoc_parser.rb
+++ b/test/rdoc/test_rdoc_parser.rb
@@ -292,6 +292,16 @@ class TestRDocParser < RDoc::TestCase
     assert_nil parser
   end
 
+  def test_class_use_markup_unknown
+    content = <<-CONTENT
+# :markup: RDoc
+    CONTENT
+
+    parser = @RP.use_markup content
+
+    assert_nil parser
+  end
+
   def test_initialize
     @RP.new @top_level, @fn, '', @options, nil