[svn r321] Fix behavior when None is passed to tostring().

--HG--
branch : trunk

CHANGES.txt

@@ -1,6 +1,15 @@
 lxml changelog
 ==============
 
+under development
+=================
+
+Bugs fixed
+----------
+
+* Passing 'None' to tostring() does not result in a segfault anymore,
+  but an AssertionError.
+
 0.7 (2005-06-15)
 ================
 

CREDITS.txt

@@ -19,6 +19,8 @@ Florian Wagner - bug reporting
 
 Emil Kroymann - bug reporting, help with encoding support
 
+dharana - bug reporting
+
 Victor Ng - Discussions on memory management strategies, vlibxml2
 
 Thanks also to:

src/lxml/etree.pyx

@@ -950,6 +950,8 @@ def tostring(_NodeBase element, encoding='us-ascii'):
     cdef tree.xmlOutputBuffer* c_buffer
     cdef tree.xmlCharEncodingHandler* enchandler
     cdef char* enc
+
+    assert element is not None
 
     #if encoding is None:
     #    encoding = 'UTF-8'

src/lxml/tests/test_etree.py

@@ -1303,6 +1303,10 @@ def test_tostring_element(self):
         self.assertEquals('<c><d></d></c>',
                           canonicalize(tostring(c)))
 
+    def test_tostring_none(self):
+        tostring = self.etree.tostring
+        self.assertRaises(AssertionError, self.etree.tostring, None)
+
     def test_tostring_element_tail(self):
         tostring = self.etree.tostring
         Element = self.etree.Element