1 files changed, 8 insertions, 2 deletions
diff --git a/src/beautifulsoup/tests/helpers.py b/src/beautifulsoup/tests/helpers.py
index 219d95c..d237556 100644
--- a/src/beautifulsoup/tests/helpers.py
+++ b/src/beautifulsoup/tests/helpers.py
@@ -3,15 +3,21 @@
 import unittest
 from beautifulsoup import BeautifulSoup
 from beautifulsoup.element import SoupStrainer
+from beautifulsoup.builder.lxml_builder import LXMLTreeBuilder
 
 class SoupTest(unittest.TestCase):
 
     default_builder = None
 
     def assertSoupEquals(self, to_parse, compare_parsed_to=None):
-        obj = BeautifulSoup(to_parse, builder=self.default_builder)
+        builder = self.default_builder
+        if builder is None:
+            builder = LXMLTreeBuilder()
+        obj = BeautifulSoup(to_parse, builder=builder)
         if compare_parsed_to is None:
             compare_parsed_to = to_parse
 
-        self.assertEquals(obj.decode(), compare_parsed_to)
+        self.assertEquals(
+            obj.decode(),
+            builder.test_fragment_to_document(compare_parsed_to))