fixtures: fix --fixtures-per-test crash on fixture-using doctest

changelog/15051.bugfix.rst

@@ -0,0 +1 @@
+Fixed crash when using :option:`--fixtures-per-test` on a fixture-using doctest.

src/_pytest/fixtures.py

@@ -2455,10 +2455,6 @@ def _show_fixtures_per_test(config: Config, session: Session) -> None:
     tw = _pytest.config.create_terminal_writer(config)
     verbose = config.get_verbosity()
 
-    def get_best_relpath(func) -> str:
-        loc = getlocation(func, invocation_dir)
-        return bestrelpath(invocation_dir, Path(loc))
-
     def write_fixture(fixture_def: FixtureDef[object]) -> None:
         argname = fixture_def.argname
         if verbose <= 0 and argname.startswith("_"):
@@ -2484,11 +2480,13 @@ def write_item(item: nodes.Item) -> None:
             # This test item does not use any fixtures.
             return
 
+        path, lineno, _test_name = item.reportinfo()
+        relpath = str(bestrelpath(invocation_dir, Path(path)))
+        title = f"{relpath}:{lineno + 1}" if lineno is not None else relpath
+
         tw.line()
         tw.sep("-", f"fixtures used by {item.name}")
-        # TODO: Fix this type ignore.
-        tw.sep("-", f"({get_best_relpath(item.function)})")  # type: ignore[attr-defined]
-
+        tw.sep("-", f"({title})")
         for fixturedef in fixturedefs:
             write_fixture(fixturedef)
 

testing/python/show_fixtures_per_test.py

@@ -161,27 +161,49 @@ def test_args(arg2, arg3):
 
 
 def test_doctest_items(pytester: Pytester) -> None:
+    pytester.makeconftest(
+        """
+        import pytest
+
+        @pytest.fixture(autouse=True)
+        def one():
+            return 1
+        """
+    )
     pytester.makepyfile(
         '''
         def foo():
             """
-            >>> 1 + 1
+            >>> getfixture('one') + 1
             2
             """
     '''
     )
     pytester.maketxtfile(
         """
-        >>> 1 + 1
+        >>> getfixture('one') + 1
         2
     """
     )
+
     result = pytester.runpytest(
         "--fixtures-per-test", "--doctest-modules", "--doctest-glob=*.txt", "-v"
     )
-    assert result.ret == 0
 
-    result.stdout.fnmatch_lines(["*collected 2 items*"])
+    assert result.ret == 0
+    result.stdout.fnmatch_lines(
+        [
+            "*collected 2 items*",
+            "* fixtures used by test_doctest_items.foo *",
+            "* (test_doctest_items.py:2) *",
+            "one -- conftest.py:3",
+            "* no docstring available",
+            "* fixtures used by test_doctest_items.txt *",
+            "* (test_doctest_items.txt:1) *",
+            "one -- conftest.py:3",
+            "* no docstring available",
+        ]
+    )
 
 
 def test_multiline_docstring_in_module(pytester: Pytester) -> None: