def test_factory_returned_none(self):
class Configurer:
def a(self) -> str:
return None
ctx = Pytel(Configurer())
self.assertRaises(ValueError, lambda: ctx._get('a'))
def test_object_not_truthy_is_valid(self):
def factory() -> int:
return 0
self.assertFalse(factory())
ctx = Pytel({'a': factory})
self.assertEqual(0, ctx._get('a'))
def test_factory_returning_subclass(self):
class D(A):
pass
def factory() -> A:
return D()
ctx = Pytel({'a': factory})
self.assertIsInstance(ctx._get('a'), D)
def test_object_not_truthy_is_valid_dependency(self):
def factory() -> int:
return 0
def factory2(a: int) -> B:
self.assertEqual(0, a)
return B()
ctx = Pytel({'a': factory, 'b': factory2})
self.assertIsInstance(ctx._get('b'), B)
def test_factory_returning_subclass_as_dependency(self):
class D(A):
pass
def factory() -> A:
return D()
ctx = Pytel({'a': factory, 'c': C})
c = ctx._get('c')
self.assertIsInstance(c, C)
self.assertIsInstance(c.a, D)
def test_configure_from_object_field(self):
class Configurer:
a = A
cc = Pytel(Configurer())
descr: ObjectDescriptor = cc._objects['a']
self.assertEqual(A, descr.object_type)
def test_cyclic_dependency_raises(self):
class Configurer:
def a(self, b: B) -> A:
pass
def b(self, a: A) -> B:
pass
self.assertRaises(ValueError, lambda: Pytel(Configurer()))
def test_dependency_wrong_type(self):
class Configurer:
def a(self, b: B) -> A:
pass
def b(self) -> A:
pass
self.assertRaises(ValueError, lambda: Pytel(Configurer()))
def test_context_manager(self):
m = Mock()
@contextlib.contextmanager
def factory() -> Mock:
yield m
with Pytel({'m': factory}) as ctx:
self.assertEqual(m, ctx._get('m'))
def test_create_from_dict(self):
svc = {
'a': A,
'b': B,
'c': C,
}
ctx = Pytel(svc)
self.assertIsInstance(ctx.a, A)
self.assertIsInstance(ctx.b, B)
self.assertIsInstance(ctx.c, C)
self.assertEqual(ctx.c.a, ctx.a)
self.assertTrue(ctx.b.initialised)
def test_create_from_class_fields(self):
class Configurer:
a = A
b = B
c = C
ctx = Pytel(Configurer())
self.assertIsInstance(ctx.a, A)
self.assertIsInstance(ctx.b, B)
self.assertTrue(ctx.b.initialised)
self.assertIsInstance(ctx.c, C)
self.assertEqual(ctx.c.a, ctx.a)
def test_create_from_many_configurers(self):
class Configurer:
a = A
b = B
m = {'c': C}
ctx = Pytel([Configurer(), m])
self.assertIsInstance(ctx.a, A)
self.assertIsInstance(ctx.b, B)
self.assertTrue(ctx.b.initialised)
self.assertIsInstance(ctx.c, C)
self.assertEqual(ctx.c.a, ctx.a)
def test_create_from_object_fields(self):
class Configurer:
def __init__(self):
self.a = A()
self.b = B
self.c = C
ctx = Pytel(Configurer())
self.assertIsInstance(ctx.a, A)
self.assertIsInstance(ctx.b, B)
self.assertTrue(ctx.b.initialised)
self.assertIsInstance(ctx.c, C)
self.assertEqual(ctx.c.a, ctx.a)
def test_inject_simple_variable(self):
class TakingString:
def __init__(self, a: str):
self.a = a
class Configurer:
a = 'A'
b = TakingString
ctx = Pytel(Configurer())
self.assertEqual('A', ctx.a)
self.assertIsInstance(ctx.b, TakingString)
self.assertEqual('A', ctx.b.a)
def test_context_manager_annotation(self):
obj = Mock()
@contextlib.contextmanager
def factory() -> Mock:
obj.opened = True
yield obj
obj.closed = True
with Pytel({'m': factory}) as ctx:
m = ctx.m
self.assertTrue(m.opened)
self.assertTrue(m.closed)
def test_create_from_object_methods(self):
class Configurer:
def a(self) -> A:
return A()
def b(self) -> B:
return B()
def c(self, a: A) -> C:
return C(a)
ctx = Pytel(Configurer())
self.assertIsInstance(ctx.a, A)
self.assertIsInstance(ctx.b, B)
self.assertTrue(ctx.b.initialised)
self.assertIsInstance(ctx.c, C)
self.assertEqual(ctx.c.a, ctx.a)
def test_context_manager(self):
class D:
def __init__(self):
self.initialised = True
self.entered = False
def __enter__(self):
self.entered = True
return self
def __exit__(self, *exc_details):
self.exited = True
return False
with Pytel({'m': D}) as ctx:
m = ctx.m
self.assertTrue(m.initialised)
self.assertTrue(m.entered)
self.assertTrue(m.exited)
def test_init_with_empty_warns(self):
with patch('pytel.pytel.log') as log_mock:
Pytel([])
log_mock.warning.assert_called_once_with('Empty context')
def test_items(self):
ctx = Pytel({'a': A})
self.assertEqual({'a': ObjectDescriptor.from_callable('a', A)}, dict(ctx.items()))
def test_keys(self):
ctx = Pytel({'a': A})
self.assertEqual(['a'], list(ctx.keys()))
def test_duplicate_names(self):
self.assertRaises(KeyError, lambda: Pytel([{
'a': A
}, {
'a': B
}]))
def test_contains(self):
p = Pytel({'a': A})
self.assertTrue('a' in p)
def test_get_missing_name(self):
ctx = Pytel([])
self.assertRaises(KeyError, lambda: ctx._get('a'))
def test_missing_dependency(self):
svc = {
'c': C,
}
self.assertRaises(ValueError, lambda: Pytel(svc)._get('c'))
def test_init(self):
ctx = {'a': A}
p = Pytel(ctx)
self.assertEqual({'a': ObjectDescriptor.from_callable('a', A)}, p._objects)
self.assertIsInstance(p._exit_stack, contextlib.ExitStack)
def test_configure_from_map(self):
cc = Pytel({'a': A})
descr: ObjectDescriptor = cc._objects['a']
self.assertEqual(A, descr.object_type)
def test_getattr_with_attribute_error(self):
p = Pytel([])
self.assertRaises(AttributeError, lambda: p.a)
def test_getattr(self):
a = A()
ctx = Pytel({'a': a})
self.assertEqual(a, ctx.a)
def test_init_with_parent_sets_parent(self):
parent = Pytel({})
child = Pytel({}, parent=parent)
self.assertEqual(parent, child._parent)
def test_init_with_none_raises(self):
self.assertRaises(ValueError, lambda: Pytel(None))
