Improve test name

We are really testing behavior for unknown file parsers here.

Author: drbrain

test/test_rdoc_parser.rb

@@ -231,17 +231,6 @@ def test_class_use_markup
     assert_equal @RP::RD, parser
   end
 
-  def test_class_use_markup_rdoc
-    content = <<-CONTENT
-# :markup: RDoc
-    CONTENT
-
-    parser = @RP.use_markup content
-
-    assert_nil parser
-  end
-
-
   def test_class_use_markup_markdown
     content = <<-CONTENT
 # coding: utf-8 markup: markdown
@@ -303,6 +292,16 @@ def test_class_use_markup_none
     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