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test_callbacks.py
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Tue, Feb 18, 20:47

test_callbacks.py
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import pytest
from pybind11_tests import callbacks as m
def test_callbacks():
from functools import partial
def func1():
return "func1"
def func2(a, b, c, d):
return "func2", a, b, c, d
def func3(a):
return "func3({})".format(a)
assert m.test_callback1(func1) == "func1"
assert m.test_callback2(func2) == ("func2", "Hello", "x", True, 5)
assert m.test_callback1(partial(func2, 1, 2, 3, 4)) == ("func2", 1, 2, 3, 4)
assert m.test_callback1(partial(func3, "partial")) == "func3(partial)"
assert m.test_callback3(lambda i: i + 1) == "func(43) = 44"
f = m.test_callback4()
assert f(43) == 44
f = m.test_callback5()
assert f(number=43) == 44
def test_bound_method_callback():
# Bound Python method:
class MyClass:
def double(self, val):
return 2 * val
z = MyClass()
assert m.test_callback3(z.double) == "func(43) = 86"
z = m.CppBoundMethodTest()
assert m.test_callback3(z.triple) == "func(43) = 129"
def test_keyword_args_and_generalized_unpacking():
def f(*args, **kwargs):
return args, kwargs
assert m.test_tuple_unpacking(f) == (("positional", 1, 2, 3, 4, 5, 6), {})
assert m.test_dict_unpacking(f) == (("positional", 1), {"key": "value", "a": 1, "b": 2})
assert m.test_keyword_args(f) == ((), {"x": 10, "y": 20})
assert m.test_unpacking_and_keywords1(f) == ((1, 2), {"c": 3, "d": 4})
assert m.test_unpacking_and_keywords2(f) == (
("positional", 1, 2, 3, 4, 5),
{"key": "value", "a": 1, "b": 2, "c": 3, "d": 4, "e": 5}
)
with pytest.raises(TypeError) as excinfo:
m.test_unpacking_error1(f)
assert "Got multiple values for keyword argument" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.test_unpacking_error2(f)
assert "Got multiple values for keyword argument" in str(excinfo.value)
with pytest.raises(RuntimeError) as excinfo:
m.test_arg_conversion_error1(f)
assert "Unable to convert call argument" in str(excinfo.value)
with pytest.raises(RuntimeError) as excinfo:
m.test_arg_conversion_error2(f)
assert "Unable to convert call argument" in str(excinfo.value)
def test_lambda_closure_cleanup():
m.test_cleanup()
cstats = m.payload_cstats()
assert cstats.alive() == 0
assert cstats.copy_constructions == 1
assert cstats.move_constructions >= 1
def test_cpp_function_roundtrip():
"""Test if passing a function pointer from C++ -> Python -> C++ yields the original pointer"""
assert m.test_dummy_function(m.dummy_function) == "matches dummy_function: eval(1) = 2"
assert (m.test_dummy_function(m.roundtrip(m.dummy_function)) ==
"matches dummy_function: eval(1) = 2")
assert m.roundtrip(None, expect_none=True) is None
assert (m.test_dummy_function(lambda x: x + 2) ==
"can't convert to function pointer: eval(1) = 3")
with pytest.raises(TypeError) as excinfo:
m.test_dummy_function(m.dummy_function2)
assert "incompatible function arguments" in str(excinfo.value)
with pytest.raises(TypeError) as excinfo:
m.test_dummy_function(lambda x, y: x + y)
assert any(s in str(excinfo.value) for s in ("missing 1 required positional argument",
"takes exactly 2 arguments"))
def test_function_signatures(doc):
assert doc(m.test_callback3) == "test_callback3(arg0: Callable[[int], int]) -> str"
assert doc(m.test_callback4) == "test_callback4() -> Callable[[int], int]"
def test_movable_object():
assert m.callback_with_movable(lambda _: None) is True

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