fix: Fixes a bug that prevents async Hypothesis tests from working wi…

…thout explicit "asyncio" marker when "--asyncio-mode=auto" is set.

The option --asyncio-mode=auto marks all async functions with the asyncio mark during the collection phase. However, when pytest collects the Hypothesis test, the @given decorator has already been applied and the Hypothesis test function is no longer a coroutine.

This commit extends the "pytest_pycollect_makeitem" hook to mark Hypothesis tests whose function body is a coroutine.

Closes #258

Signed-off-by: Michael Seifert <m.seifert@digitalernachschub.de>

README.rst

@@ -256,6 +256,10 @@ or an async framework such as `asynctest <https://asynctest.readthedocs.io/en/la
 
 Changelog
 ---------
+0.17.1 (UNRELEASED)
+~~~~~~~~~~~~~~~~~~~
+- Fixes a bug that prevents async Hypothesis tests from working without explicit ``asyncio`` marker when ``--asyncio-mode=auto`` is set. `#258 <https://github.com/pytest-dev/pytest-asyncio/issues/258>`_
+
 0.17.0 (22-01-13)
 ~~~~~~~~~~~~~~~~~~~
 - `pytest-asyncio` no longer alters existing event loop policies. `#168 <https://github.com/pytest-dev/pytest-asyncio/issues/168>`_, `#188 <https://github.com/pytest-dev/pytest-asyncio/issues/168>`_

pytest_asyncio/plugin.py

@@ -115,7 +115,13 @@ def pytest_configure(config):
 @pytest.mark.tryfirst
 def pytest_pycollect_makeitem(collector, name, obj):
     """A pytest hook to collect asyncio coroutines."""
-    if collector.funcnamefilter(name) and _is_coroutine(obj):
+    if not collector.funcnamefilter(name):
+        return
+    if (
+        _is_coroutine(obj)
+        or _is_hypothesis_test(obj)
+        and _hypothesis_test_wraps_coroutine(obj)
+    ):
         item = pytest.Function.from_parent(collector, name=name)
         if "asyncio" in item.keywords:
             return list(collector._genfunctions(name, obj))
@@ -128,6 +134,10 @@ def pytest_pycollect_makeitem(collector, name, obj):
                 return ret
 
 
+def _hypothesis_test_wraps_coroutine(function):
+    return _is_coroutine(function.hypothesis.inner_test)
+
+
 class FixtureStripper:
     """Include additional Fixture, and then strip them"""
 

tests/hypothesis/test_base.py

@@ -6,6 +6,8 @@
 import pytest
 from hypothesis import given, strategies as st
 
+from pytest_asyncio.plugin import Mode
+
 
 @pytest.fixture(scope="module")
 def event_loop():
@@ -26,6 +28,21 @@ async def test_mark_outer(n):
     assert isinstance(n, int)
 
 
+@given(n=st.integers())
+async def test_async_auto_marked(pytestconfig, n: int):
+    assert pytestconfig.inicfg["asyncio_mode"] == Mode.AUTO
+    assert isinstance(n, int)
+
+
+@given(n=st.integers())
+def test_sync_not_auto_marked(pytestconfig, request, n: int):
+    """Assert that synchronous Hypothesis functions are not marked with asyncio"""
+    assert pytestconfig.inicfg["asyncio_mode"] == Mode.AUTO
+    markers = [marker.name for marker in request.node.own_markers]
+    assert "asyncio" not in markers
+    assert isinstance(n, int)
+
+
 @pytest.mark.parametrize("y", [1, 2])
 @given(x=st.none())
 @pytest.mark.asyncio