Function TEST_SUBMODULE

tests/test_callbacks.cpp:45–302

int dummy_function(int i) { return i + 1; }

TEST_SUBMODULE(callbacks, m) {
    // test_callbacks, test_function_signatures
    m.def("test_callback1", [](const py::object &func) { return func(); });
    m.def("test_callback2", [](const py::object &func) { return func("Hello", 'x', true, 5); });
    m.def("test_callback3", [](const std::function<int(int)> &func) {
        return "func(43) = " + std::to_string(func(43));
    });
    m.def("test_callback4",
          []() -> std::function<int(int)> { return [](int i) { return i + 1; }; });
    m.def("test_callback5",
          []() { return py::cpp_function([](int i) { return i + 1; }, py::arg("number")); });

    // test_keyword_args_and_generalized_unpacking
    m.def("test_tuple_unpacking", [](const py::function &f) {
        auto t1 = py::make_tuple(2, 3);
        auto t2 = py::make_tuple(5, 6);
        return f("positional", 1, *t1, 4, *t2);
    });

    m.def("test_dict_unpacking", [](const py::function &f) {
        auto d1 = py::dict("key"_a = "value", "a"_a = 1);
        auto d2 = py::dict();
        auto d3 = py::dict("b"_a = 2);
        return f("positional", 1, **d1, **d2, **d3);
    });

    m.def("test_keyword_args", [](const py::function &f) { return f("x"_a = 10, "y"_a = 20); });

    m.def("test_unpacking_and_keywords1", [](const py::function &f) {
        auto args = py::make_tuple(2);
        auto kwargs = py::dict("d"_a = 4);
        return f(1, *args, "c"_a = 3, **kwargs);
    });

    m.def("test_unpacking_and_keywords2", [](const py::function &f) {
        auto kwargs1 = py::dict("a"_a = 1);
        auto kwargs2 = py::dict("c"_a = 3, "d"_a = 4);
        return f("positional",
                 *py::make_tuple(1),
                 2,
                 *py::make_tuple(3, 4),
                 5,
                 "key"_a = "value",
                 **kwargs1,
                 "b"_a = 2,
                 **kwargs2,
                 "e"_a = 5);
    });

    m.def("test_unpacking_error1", [](const py::function &f) {
        auto kwargs = py::dict("x"_a = 3);
        return f("x"_a = 1, "y"_a = 2, **kwargs); // duplicate ** after keyword
    });

    m.def("test_unpacking_error2", [](const py::function &f) {
        auto kwargs = py::dict("x"_a = 3);
        return f(**kwargs, "x"_a = 1); // duplicate keyword after **
    });