Hypothesis tests that are class members are passed self twice

[jdpage]

Things to check first

• I have searched the existing issues and didn't find my bug already reported there

• I have checked that my bug is still present in the latest release

AnyIO version

4.3.0

Python version

3.12.2

What happened?

When running a hypothesis test that is a class member, the test runner fails with a TypeError, citing multiple values for self being passed.

How can we reproduce the bug?

The following script reproduces the issue, using pytest 8.1.1 and hypothesis 6.99.5:

from hypothesis import strategies as st, given
import pytest


class TestSomething:
    @given(x=st.just(1))
    @pytest.mark.anyio
    async def test_foo(self, x):
        assert x == 1

The following output is produced under pytest:

================================================= test session starts ==================================================
platform linux -- Python 3.12.2, pytest-8.1.1, pluggy-1.4.0
rootdir: /home/thyme/src/scratch/repro
plugins: hypothesis-6.99.5, anyio-4.3.0
collected 2 items                                                                                                      

ex.py FF                                                                                                         [100%]

======================================================= FAILURES =======================================================
___________________________________________ TestSomething.test_foo[asyncio] ____________________________________________

self = <ex.TestSomething object at 0x7f3b1a13a180>

    @given(x=st.just(1))
>   @pytest.mark.anyio

ex.py:7: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.venv/lib64/python3.12/site-packages/anyio/pytest_plugin.py:105: in run_with_hypothesis
    runner.run_test(original_func, kwargs)
.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1970: in run_test
    self._raise_async_exceptions()
.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1884: in _raise_async_exceptions
    raise exceptions[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <anyio._backends._asyncio.TestRunner object at 0x7f3b193721e0>
test_func = <function TestSomething.test_foo at 0x7f3b194ade40>
kwargs = {'self': <ex.TestSomething object at 0x7f3b1a13a180>, 'x': 1}

    def run_test(
        self, test_func: Callable[..., Coroutine[Any, Any, Any]], kwargs: dict[str, Any]
    ) -> None:
        try:
            self.get_loop().run_until_complete(
>               self._call_in_runner_task(test_func, **kwargs)
            )
E           TypeError: TestRunner._call_in_runner_task() got multiple values for argument 'self'
E           Falsifying example: run_with_hypothesis(
E               self=<ex.TestSomething object at 0x7f3b1a13a180>,
E               x=1,
E           )

.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1965: TypeError
_____________________________________________ TestSomething.test_foo[trio] _____________________________________________

self = <ex.TestSomething object at 0x7f3b1949e570>

    @given(x=st.just(1))
>   @pytest.mark.anyio

ex.py:7: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.venv/lib64/python3.12/site-packages/anyio/pytest_plugin.py:105: in run_with_hypothesis
    runner.run_test(original_func, kwargs)
.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1970: in run_test
    self._raise_async_exceptions()
.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1884: in _raise_async_exceptions
    raise exceptions[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <anyio._backends._asyncio.TestRunner object at 0x7f3b19373b90>
test_func = <function TestSomething.test_foo at 0x7f3b194ade40>
kwargs = {'self': <ex.TestSomething object at 0x7f3b1949e570>, 'x': 1}

    def run_test(
        self, test_func: Callable[..., Coroutine[Any, Any, Any]], kwargs: dict[str, Any]
    ) -> None:
        try:
            self.get_loop().run_until_complete(
>               self._call_in_runner_task(test_func, **kwargs)
            )
E           TypeError: TestRunner._call_in_runner_task() got multiple values for argument 'self'
E           Falsifying example: run_with_hypothesis(
E               self=<ex.TestSomething object at 0x7f3b1949e570>,
E               x=1,
E           )

.venv/lib64/python3.12/site-packages/anyio/_backends/_asyncio.py:1965: TypeError
=============================================== short test summary info ================================================
FAILED ex.py::TestSomething::test_foo[asyncio] - TypeError: TestRunner._call_in_runner_task() got multiple values for argument 'self'
FAILED ex.py::TestSomething::test_foo[trio] - TypeError: TestRunner._call_in_runner_task() got multiple values for argument 'self'
================================================== 2 failed in 0.30s ===================================================

[jdpage]

As a workaround, changing the name of the method receiver parameter from self to something else solves the problem, e.g. the following behaves correctly:

from hypothesis import strategies as st, given
import pytest


class TestSomething:
    @given(x=st.just(1))
    @pytest.mark.anyio
    async def test_foo(_, x):  # self is now _
        assert x == 1