def test_pop_without_index(self):
"""
Test the pop method without index
"""
dlist = DiskList()
dlist.append('0')
dlist.append('1')
dlist.append('2')
dlist.append('3')
result = dlist.pop()
self.assertTrue(dlist[0] == '0' and dlist[1] == '1' and dlist[2] == '2'
and result == '3' and len(dlist) == 3)
