def test_callable_overwrite_with_callable(self):
"Allows overwriting a callable with a callable."
x = Settings()
x.a = lambda s: s.init + " original"
x.a = lambda s: s.a + " and derived"
x.init = "init"
self.assertEqual(x.a, "init original and derived")
def test_no_callable_overwrite_non_callable(self):
"Disallows overwriting a callable with non-callable."
x = Settings()
x.a = lambda s: 1
with self.assertRaisesRegex(
AttributeError, "^trying to override attribute 'a' "
"from a callable value to a non-callable "
"one"):
x.a = 1
def test_as_dict(self):
"The ``as_dict`` method returns a dictionary of values."
x = Settings()
x.a = lambda s: s.init + " original"
x.a = lambda s: s.a + " and derived"
x.init = "init"
self.assertEqual(x.as_dict(), {
"a": "init original and derived",
"init": "init",
})
def test_set_get(self):
"Sets and gets values."
x = Settings()
x.a = 1
x.b = 2
self.assertEqual(x.a, 1)
self.assertEqual(x.b, 2)
def test_parent(self):
"Fetches values from parent."
parent = Settings()
child = Settings(parent)
parent.a = 1
parent.b = 2
child.b = "overriden"
self.assertEqual(child.a, 1)
self.assertEqual(child.b, "overriden")