def test_sets_undefined_key(self):
a = [
{'a': 1, 'b': 1}
]
p = Ensure({'c': 2})
p.bind(a)
for i in p:
self.assertIn('c', i)
def test_does_not_overwrite_existing_key(self):
a = [
{'a': 1, 'b': 1}
]
p = Ensure({'a': 2})
p.bind(a)
for i in p:
self.assertIn('a', i)
self.assertEquals(i['a'], 1)
