[fix] Fixed a bug that causes markers to be duplicated for async test functions.

Signed-off-by: Michael Seifert <[email protected]>

Author: seifertm

pytest_asyncio/plugin.py

@@ -392,7 +392,8 @@ def _from_function(cls, function: Function, /) -> Function:
         Instantiates this specific PytestAsyncioFunction type from the specified
         Function item.
         """
-        assert function.get_closest_marker("asyncio")
+        asyncio_marker = function.get_closest_marker("asyncio")
+        assert asyncio_marker
         subclass_instance = cls.from_parent(
             function.parent,
             name=function.name,
@@ -402,7 +403,7 @@ def _from_function(cls, function: Function, /) -> Function:
             keywords=function.keywords,
             originalname=function.originalname,
         )
-        subclass_instance.own_markers.extend(function.own_markers)
+        subclass_instance.own_markers.append(asyncio_marker)
         subclassed_function_signature = inspect.signature(subclass_instance.obj)
         if "event_loop" in subclassed_function_signature.parameters:
             subclass_instance.warn(

tests/markers/test_function_scope.py

@@ -197,3 +197,24 @@ async def test_anything():
     )
     result = pytester.runpytest_subprocess("--asyncio-mode=strict")
     result.assert_outcomes(warnings=0, passed=1)
+
+
+def test_asyncio_mark_does_not_duplicate_other_marks_in_auto_mode(
+    pytester: Pytester,
+):
+    pytester.makepyfile(
+        dedent(
+            """\
+            import pytest
+
+            @pytest.mark.dummy_marker
+            async def test_markers_not_duplicated(request):
+                markers = []
+                for node, marker in request.node.iter_markers_with_node():
+                    markers.append(marker)
+                assert len(markers) == 2
+            """
+        )
+    )
+    result = pytester.runpytest_subprocess("--asyncio-mode=auto")
+    result.assert_outcomes(warnings=0, passed=1)