def test_atomic_evaluation(self):
d = lazydict.LazyDictionary()
d['division'] = lambda: 1/0
self.assertEqual(d.states['division'], 'defined')
self.assertRaises(ZeroDivisionError, d.__getitem__, 'division')
# second call checks lazydict.CircularReferenceError is not raised.
self.assertRaises(ZeroDivisionError, d.__getitem__, 'division')
self.assertEqual(d.states['division'], 'error')
def test_constant_redefinition_error(self):
d = lazydict.LazyDictionary()
d['a'] = 1
d['b'] = 2
d['sum'] = lambda s: s['a'] + s['b']
x = d['sum']
self.assertRaises(lazydict.ConstantRedefinitionError, d.__setitem__, 'a', 'hotdog')
self.assertRaises(lazydict.ConstantRedefinitionError, d.__delitem__, 'a')
def test_circular_reference_error(self):
d = lazydict.LazyDictionary()
d['foo'] = lambda s: s['foo']
self.assertRaises(lazydict.CircularReferenceError, d.__getitem__, 'foo')
def test_repr(self):
d = lazydict.LazyDictionary({'a': {'b': 1}})
self.assertEqual(repr(d), "LazyDictionary({'a': {'b': 1}})")
def test_str(self):
d = lazydict.LazyDictionary({'a': {'b': 1}})
self.assertEqual(str(d), "{'a': {'b': 1}}")
def test_lazy_evaluation(self):
d = lazydict.LazyDictionary()
d['sum'] = lambda s: s['a'] + s['b']
d['a'] = 1
d['b'] = 2
self.assertEqual(d['sum'], 3)