def test_first_object_kept(self):
a, b = float("nan"), float("nan")
self.assertTrue(a is not b) #prerequisite
s = PyObjectMap()
s[a] = a
s[b] = b
lst = list(s.items())
self.assertEqual(len(lst), 1)
self.assertTrue(a is lst[0][0])
def test_map_interator_right_refcnts(self):
a = 4200
s = PyObjectMap()
old_ref_cnt = sys.getrefcount(a)
s[a] = a
self.assertEqual(sys.getrefcount(a), old_ref_cnt + 2)
lst = list(s.items())
# now also lst helds two additional references
self.assertEqual(sys.getrefcount(a), old_ref_cnt + 4)