def test_basic_type():
assert is_instance(5, int)
def test_ellipsis():
assert is_instance(..., 'ellipsis')
def test_union(value, type_, expected):
assert is_instance(value, type_) == expected
def test_nested_generics():
assert is_instance(([1.5], 'bar'), Tuple[List[float], str])
def test_any():
assert is_instance(5, Any)
def test_unannotated_callable(value, type_):
with pytest.raises(ValueError):
is_instance(value, type_)
def test_tuple():
assert is_instance(('bar', True), Tuple[str, bool])
def test_generic_iterable_with_mixed_types():
assert not is_instance([1, 2.5], List[int])
def test_generic_mapping():
assert is_instance({1: 'foo'}, Dict[int, str])
def test_empty_iterable():
assert is_instance([], List[bool])
def test_bounded_typevar(value, bound, expected):
var = TypeVar('T', bound=bound)
assert is_instance(value, var) == expected
def test_typevar(value, constraints, expected):
var = TypeVar('T', *constraints)
assert is_instance(value, var) == expected
def test_callable_with_typevars(value, type_, expected):
assert is_instance(value, type_) == expected
def test_generic_iterable():
assert is_instance([1, 2], List[int])
def test_supportsX(value, type_, expected):
assert is_instance(value, type_) == expected
def test_generic_mapping_detects_wrong_value_type():
assert not is_instance({1: 'foo'}, Dict[int, float])
def test_iterable(value, type_, expected):
assert is_instance(value, type_) == expected
def test_typing_type():
assert is_instance([], List)