Index: pyyaml/trunk/tests/test_appliance.py
===================================================================
--- pyyaml/trunk/tests/test_appliance.py	(revision 146)
+++ pyyaml/trunk/tests/test_appliance.py	(revision 150)
@@ -27,5 +27,5 @@
                 def test_method(self, test=test, filenames=filenames):
                     getattr(self, '_'+method_name)(test, *filenames)
-                test = test.replace('-', '_')
+                test = test.replace('-', '_').replace('.', '_')
                 try:
                     test_method.__name__ = '%s_%s' % (method_name, test)