def _find_rows_parametric( # noqa: WPS231
self,
source_type: Type[SourceType],
destination_type: Type[DestinationType],
) -> Iterable[Row[SourceType, DestinationType]]:
"""Find suitable conversion arrows by DestinationType superclasses."""
for row in self.items():
(source, destination), cast = row
if source != source_type:
continue
if getattr(destination, '__origin__', None) != SubclassOf:
continue
destination_superclass, = generic_type_args(destination)
if not issubclass(destination_type, destination_superclass):
continue # pragma: no cover
yield row
def value_type(self) -> Type[ValueType]:
"""Type of the values."""
return generic_type_args(self)[1]
def key_type(self) -> Type[KeyType]:
"""Type of the keys."""
return generic_type_args(self)[0]
def test_failure(type_or_value):
"""Test a value which does not have generic parameters."""
with pytest.raises(TypeArgsError):
generic_type_args(type_or_value)
def test_get_args_docstring(generic_type, type_parameters):
"""Tests for typing.Generic."""
assert generic_type_args(generic_type) == type_parameters
def value_type(self) -> Type[ValueType]:
"""Extract the type of queue message from type args."""
return generic_type_args(self)[0]
def test_generic_with_inheritance(generic_type, type_parameters):
"""Test inheritance from generic type."""
subclass_type = types.new_class('SubClass', (generic_type, ), {})
assert generic_type_args(subclass_type) == type_parameters
def test_plain_generic(generic_type, type_parameters):
"""Test generic type."""
assert generic_type_args(generic_type) == type_parameters