250     def testdelitemwithoutnodetree(self):

   251         index, _junk = parsers.parse_index2(data_non_inlined, False)

   252 

   253         def hexrev(rev):

   254             if rev == nullrev:

   255                 return b'\xff\xff\xff\xff'

   256             else:

   257                 return nodemod.bin('%08x' % rev)

   258 

   259         def appendrev(p1, p2=nullrev):

   260             # node won't matter for this test, let's just make sure

   261             # they don't collide. Other data don't matter either.

   262             node = hexrev(p1) + hexrev(p2) + b'.' * 12

   263             index.append((0, 0, 12, 1, 34, p1, p2, node))

   264 

   265         appendrev(4)

   266         appendrev(5)

   267         appendrev(6)

   268         self.assertEqual(len(index), 7)

   269 

   270         del index[1:7]

   271 

   272         # assertions that failed before correction

   273         self.assertEqual(len(index), 1)  # was 4

   274         self.assertEqual(index.headrevs(), [0])  # gave ValueError

   275