def test_iteration_and_repr(self):
d = ProxyDict({1: 'a', 3: 'c'})
e = ProxyDict({'a': 'b', 'c': 'd'})
self.assertEqual(set(d), {1, 3})
self.assertEqual(set(e), {'a', 'c'})
self.assertEqual(
str(d),
"ProxyDict({1: 'a', 3: 'c'})",
)
self.assertEqual(
str(e),
"ProxyDict({'a': 'b', 'c': 'd'})",
)
def test_accepts_multiple_mappings(self):
m1 = {1: 'a', 3: 'c'}
m2 = {2: 'b', 5: 'z'}
m3 = {4: 'd', 5: 'e'}
d = ProxyDict(m1, m2, m3)
self.assertEqual(d, {1: 'a', 2: 'b', 3: 'c', 4: 'd', 5: 'e'})
self.assertEqual(d[5], 'e')
def test_can_access_keys(self):
d = ProxyDict({'a': 'b', 'c': 'd'})
self.assertEqual(d['a'], 'b')
self.assertEqual(d['c'], 'd')
with self.assertRaises(KeyError):
d['b']
d[0]
def test_cannot_write_to_keys(self):
d = ProxyDict({0: 'b', 1: 'd'})
self.assertEqual(d[0], 'b')
with self.assertRaises(Exception):
d[0] = 'e'
with self.assertRaises(Exception):
d[3] = 'z'
def test_items_len_values_items_and_get(self):
d = ProxyDict({'a': 'b', 'c': 'd'})
self.assertEqual(set(d.items()), {('a', 'b'), ('c', 'd')})
self.assertEqual(set(d.values()), {'b', 'd'})
self.assertEqual(len(d), 2)
self.assertEqual(d.get('a'), 'b')
self.assertEqual(d.get('a', 'z'), 'b')
self.assertEqual(d.get('d'), None)
self.assertEqual(d.get('d', 'z'), 'z')
def test_maps_attribute_and_repr(self):
m1 = {1: 'a', 3: 'c'}
m2 = {2: 'b', 5: 'z'}
m3 = {4: 'd', 5: 'e'}
d = ProxyDict(m1, m2, m3)
self.assertEqual(d.maps, [m1, m2, m3])
self.assertEqual(
str(d),
"ProxyDict({1: 'a', 3: 'c'}, {2: 'b', 5: 'z'}, {4: 'd', 5: 'e'})",
)
def test_supports_equality(self):
mapping1 = {'a': 1, 'b': 2}
mapping2 = {'a': 1}
a = ProxyDict(mapping1)
b = ProxyDict(mapping2)
c = ProxyDict(mapping1)
self.assertEqual(a, mapping1)
self.assertEqual(b, mapping2)
self.assertEqual(a, c)
self.assertNotEqual(a, b)
self.assertIs(a != mapping1, False)
self.assertIs(a == b, False)
mapping2['b'] = 2
self.assertEqual(b, mapping2)
self.assertEqual(a, mapping1)
self.assertEqual(a, b)
self.assertNotEqual(a, ['a', 'b'])
self.assertEqual(a, defaultdict(int, {'a': 1, 'b': 2}))
self.assertEqual(a, Counter('abb'))
def test_has_keys(self):
d = ProxyDict({'a': 'b', 'c': 'd'})
self.assertEqual(set(d.keys()), {'a', 'c'})
def test_changes_when_underlying_mapping_changes(self):
mapping = {'a': 'b', 'c': 'd'}
d = ProxyDict(mapping)
self.assertEqual(d['a'], 'b')
mapping['a'] = 'z'
self.assertEqual(d['a'], 'z')
def test_cannot_pop_key(self):
d = ProxyDict({0: 'b', 1: 'd'})
with self.assertRaises(Exception):
d.pop(0)
self.assertEqual(d[0], 'b')
def test_cannot_set_default_values(self):
d = ProxyDict({0: 'b', 1: 'd'})
with self.assertRaises(Exception):
d.setdefault(2, 'e')
def test_cannot_update(self):
d = ProxyDict({0: 'b', 1: 'd'})
with self.assertRaises(Exception):
d.update({3: 'z'})
