pybind11/tests/test_kwargs_and_defaults.py

import pytest
from pybind11_tests import (kw_func0, kw_func1, kw_func2, kw_func3, kw_func4, args_function,
                            args_kwargs_function, kw_func_udl, kw_func_udl_z, KWClass)


def test_function_signatures(doc):
    assert doc(kw_func0) == "kw_func0(arg0: int, arg1: int) -> str"
    assert doc(kw_func1) == "kw_func1(x: int, y: int) -> str"
    assert doc(kw_func2) == "kw_func2(x: int=100, y: int=200) -> str"
    assert doc(kw_func3) == "kw_func3(data: str='Hello world!') -> None"
    assert doc(kw_func4) == "kw_func4(myList: List[int]=[13, 17]) -> str"
    assert doc(kw_func_udl) == "kw_func_udl(x: int, y: int=300) -> str"
    assert doc(kw_func_udl_z) == "kw_func_udl_z(x: int, y: int=0) -> str"
    assert doc(args_function) == "args_function(*args) -> tuple"
    assert doc(args_kwargs_function) == "args_kwargs_function(*args, **kwargs) -> tuple"
    assert doc(KWClass.foo0) == "foo0(self: m.KWClass, arg0: int, arg1: float) -> None"
    assert doc(KWClass.foo1) == "foo1(self: m.KWClass, x: int, y: float) -> None"


def test_named_arguments(msg):
    assert kw_func0(5, 10) == "x=5, y=10"

    assert kw_func1(5, 10) == "x=5, y=10"
    assert kw_func1(5, y=10) == "x=5, y=10"
    assert kw_func1(y=10, x=5) == "x=5, y=10"

    assert kw_func2() == "x=100, y=200"
    assert kw_func2(5) == "x=5, y=200"
    assert kw_func2(x=5) == "x=5, y=200"
    assert kw_func2(y=10) == "x=100, y=10"
    assert kw_func2(5, 10) == "x=5, y=10"
    assert kw_func2(x=5, y=10) == "x=5, y=10"

    with pytest.raises(TypeError) as excinfo:
        # noinspection PyArgumentList
        kw_func2(x=5, y=10, z=12)
    if hasattr(excinfo, "match"):  # (pytest <3.0 doesn't have `.match()`)
        assert excinfo.match(
            r'(?s)^kw_func2\(\): incompatible.*Invoked with: kwargs: ((x=5|y=10|z=12)(, |$))' +
            '{3}$')

    assert kw_func4() == "{13 17}"
    assert kw_func4(myList=[1, 2, 3]) == "{1 2 3}"

    assert kw_func_udl(x=5, y=10) == "x=5, y=10"
    assert kw_func_udl_z(x=5) == "x=5, y=0"


def test_arg_and_kwargs():
    args = 'arg1_value', 'arg2_value', 3
    assert args_function(*args) == args

    args = 'a1', 'a2'
    kwargs = dict(arg3='a3', arg4=4)
    assert args_kwargs_function(*args, **kwargs) == (args, kwargs)


def test_mixed_args_and_kwargs(msg):
    from pybind11_tests import (mixed_plus_args, mixed_plus_kwargs, mixed_plus_args_kwargs,
                                mixed_plus_args_kwargs_defaults)
    mpa = mixed_plus_args
    mpk = mixed_plus_kwargs
    mpak = mixed_plus_args_kwargs
    mpakd = mixed_plus_args_kwargs_defaults

    assert mpa(1, 2.5, 4, 99.5, None) == (1, 2.5, (4, 99.5, None))
    assert mpa(1, 2.5) == (1, 2.5, ())
    with pytest.raises(TypeError) as excinfo:
        assert mpa(1)
    assert msg(excinfo.value) == """
        mixed_plus_args(): incompatible function arguments. The following argument types are supported:
            1. (arg0: int, arg1: float, *args) -> tuple

        Invoked with: 1
    """  # noqa: E501 line too long
    with pytest.raises(TypeError) as excinfo:
        assert mpa()
    assert msg(excinfo.value) == """
        mixed_plus_args(): incompatible function arguments. The following argument types are supported:
            1. (arg0: int, arg1: float, *args) -> tuple

        Invoked with:
    """  # noqa: E501 line too long

    assert mpk(-2, 3.5, pi=3.14159, e=2.71828) == (-2, 3.5, {'e': 2.71828, 'pi': 3.14159})
    assert mpak(7, 7.7, 7.77, 7.777, 7.7777, minusseven=-7) == (
        7, 7.7, (7.77, 7.777, 7.7777), {'minusseven': -7})
    assert mpakd() == (1, 3.14159, (), {})
    assert mpakd(3) == (3, 3.14159, (), {})
    assert mpakd(j=2.71828) == (1, 2.71828, (), {})
    assert mpakd(k=42) == (1, 3.14159, (), {'k': 42})
    assert mpakd(1, 1, 2, 3, 5, 8, then=13, followedby=21) == (
        1, 1, (2, 3, 5, 8), {'then': 13, 'followedby': 21})
    # Arguments specified both positionally and via kwargs should fail:
    with pytest.raises(TypeError) as excinfo:
        assert mpakd(1, i=1)
    assert msg(excinfo.value) == """
        mixed_plus_args_kwargs_defaults(): incompatible function arguments. The following argument types are supported:
            1. (i: int=1, j: float=3.14159, *args, **kwargs) -> tuple

        Invoked with: 1; kwargs: i=1
    """  # noqa: E501 line too long
    with pytest.raises(TypeError) as excinfo:
        assert mpakd(1, 2, j=1)
    assert msg(excinfo.value) == """
        mixed_plus_args_kwargs_defaults(): incompatible function arguments. The following argument types are supported:
            1. (i: int=1, j: float=3.14159, *args, **kwargs) -> tuple

        Invoked with: 1, 2; kwargs: j=1
    """  # noqa: E501 line too long