def test_freeze_thaw_cycle(self):
# freeze then thaw
d = FreezableDict(a=1).freeze().thaw()
self.assertRaises(TypeError, lambda: {d: 1})
d['b'] = 2
# then refreeze
d.freeze()
self.assertEqual({d: 1}[d], 1)
def test_frozen_delitem(self):
d = FreezableDict(a=1).freeze()
def f():
del d['a']
self.assertRaises(TypeError, f)
def test_frozen_setitem(self):
d = FreezableDict(a=2).freeze()
def f():
d['a'] = 1
self.assertRaises(TypeError, f)
def test_dict_methods(self):
fd = FreezableDict(a=1, b=2)
d = dict(a=1, b=2)
for method in ['items', 'keys', 'values']:
self.assertEqual(
list(getattr(d, method)()),
list(getattr(fd, method)()),
)
def test_thawed_setitem(self):
d = FreezableDict(a=2)
d['a'] = 1
self.assertEqual(d['a'], 1)
def test_thawed_unhashability(self):
d = FreezableDict(a=1)
self.assertRaises(TypeError, lambda: {d: 1})
def test_frozen_hashability(self):
d = FreezableDict(a=1).freeze()
self.assertEqual({d: 1, 'b': 2}[d], 1)
def test_thawed_delitem(self):
d = FreezableDict(a=1)
del d['a']
self.assertRaises(KeyError, lambda: d['a'])