def test_list_extender(self):
"""list_adder should add items to list, creating if necessary"""
d = dummy()
list_extender(d, "x", "345")
self.assertEqual(d.x, ["3", "4", "5"])
list_extender(d, "x", "abc")
self.assertEqual(d.x, ["3", "4", "5", "a", "b", "c"])
list_extender(d, "y", [2, 3])
self.assertEqual(d.x, ["3", "4", "5", "a", "b", "c"])
self.assertEqual(d.y, [2, 3])
list_extender(d, "y", None)
self.assertEqual(d.y, [2, 3, None])
def _pmid_adder(obj, field, line):
"""Adds pmid to relevant field"""
list_extender(obj, field, _read_pmid(line))
