def test_refcount(self):
obj = "my very large and random string with numbers 1234"
rc = sys.getrefcount(obj)
# Test nest.front. This doesn't involve returning nests
# from C++ to Python.
nest.front((None, obj))
self.assertEqual(rc, sys.getrefcount(obj))
nest.front(obj)
self.assertEqual(rc, sys.getrefcount(obj))
nest.front((obj, ))
self.assertEqual(rc, sys.getrefcount(obj))
nest.front((obj, obj, [obj, {"obj": obj}, obj]))
self.assertEqual(rc, sys.getrefcount(obj))
# Test returning nests of Nones.
nest.map(lambda x: None, (obj, obj, [obj, {"obj": obj}, obj]))
self.assertEqual(rc, sys.getrefcount(obj))
# Test returning actual nests.
nest.map(lambda s: s, obj)
self.assertEqual(rc, sys.getrefcount(obj))
nest.map(lambda x: x, {"obj": obj})
self.assertEqual(rc, sys.getrefcount(obj))
nest.map(lambda x: x, (obj, ))
self.assertEqual(rc, sys.getrefcount(obj))
nest.map(lambda s: s, (obj, obj))
nest.map(lambda s: s, (obj, obj))
self.assertEqual(rc, sys.getrefcount(obj))
n = nest.map(lambda s: s, (obj, ))
self.assertEqual(rc + 1, sys.getrefcount(obj))
del n
self.assertEqual(rc, sys.getrefcount(obj))
def test_front(self):
self.assertEqual(nest.front((1, 2, 3)), 1)
self.assertEqual(nest.front((2, 3)), 2)
self.assertEqual(nest.front((3, )), 3)