def test_single_level_present(self):
a = {'john': 'ford'}
self.assertEqual(subject.lookup('john', a), 'ford')
def test_multi_level_bad_intermediate_key(self):
a = {'john': 69}
with self.assertRaises(KeyError):
subject.lookup('john.harrison.ford', a)
def test_multi_level_partial_key(self):
a = {'john': {'steven'}}
with self.assertRaises(KeyError):
subject.lookup('john.harrison.ford', a)
def test_multi_level_absent(self):
a = {}
with self.assertRaises(KeyError):
subject.lookup('john.harrison.ford', a)
def test_multi_level_present(self):
a = {'john': {'harrison': {'ford': 69}}}
self.assertEqual(subject.lookup('john.harrison.ford', a), 69)
def test_single_level_absent(self):
a = {}
with self.assertRaises(KeyError):
subject.lookup('john', a)
