working around syck defects by optionally matching a space [#4426 state:resolved]

Signed-off-by: Nwycats <wycats@gmail.com>

activerecord/test/cases/xml_serialization_test.rb

@@ -79,7 +79,7 @@ def test_should_serialize_boolean
   end
 
   def test_should_serialize_yaml
-    assert_match %r{<preferences type=\"yaml\">--- \n:gem: ruby\n</preferences>}, @xml
+    assert_match %r{<preferences type=\"yaml\">---\s?\n:gem: ruby\n</preferences>}, @xml
   end
 end