DoctTest line numbers not found due to method wrapping. (pytest-dev#8796

)

src/_pytest/doctest.py

@@ -506,6 +506,11 @@ def _find_lineno(self, obj, source_lines):
                 """
                 if isinstance(obj, property):
                     obj = getattr(obj, "fget", obj)
+
+                if hasattr(obj, "__wrapped__"):
+                    # Get the main obj in case of it being wrapped
+                    obj = inspect.unwrap(obj)
+
                 # Type ignored because this is a private function.
                 return doctest.DocTestFinder._find_lineno(  # type: ignore
                     self,

testing/test_doctest.py

@@ -1164,6 +1164,41 @@ def test_continue_on_failure(self, pytester: Pytester):
             ["*4: UnexpectedException*", "*5: DocTestFailure*", "*8: DocTestFailure*"]
         )
 
+    def test_skipping_wrapped_test(self, pytester):
+        """
+        Issue 8796: INTERNALERROR raised when skipping a decorated DocTest
+        through pytest_collection_modifyitems.
+        """
+        pytester.makeconftest(
+            """
+            import pytest
+            from _pytest.doctest import DoctestItem
+
+            def pytest_collection_modifyitems(config, items):
+                skip_marker = pytest.mark.skip()
+
+                for item in items:
+                    if isinstance(item, DoctestItem):
+                        item.add_marker(skip_marker)
+            """
+        )
+
+        pytester.makepyfile(
+            """
+            from contextlib import contextmanager
+
+            @contextmanager
+            def my_config_context():
+                '''
+                >>> import os
+                '''
+            """
+        )
+
+        result = pytester.runpytest("--doctest-modules")
+        assert "INTERNALERROR" not in result.stdout.str()
+        result.assert_outcomes(skipped=1)
+
 
 class TestDoctestAutoUseFixtures: