Setting maxDiff to None to get a better idea what's wrong.

compressor/tests/templatetags.py

@@ -47,6 +47,8 @@ class TemplatetagTestCase(TestCase):
         out = css_tag("/media/CACHE/css/e41ba2cc6982.css")
         self.assertEqual(out, render(template, self.context))
 
+    maxDiff = None
+
     def test_uppercase_rel(self):
         template = u"""{% load compress %}{% compress css %}
 <link rel="StyleSheet" href="{{ MEDIA_URL }}css/one.css" type="text/css">