From a8eb81994e4f392de15ff19189bb0ed0fd4f0dc2 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 1 Jul 2023 16:04:22 -0400
Subject: [PATCH] Reverse order on marks from MRO

Fixes #10447
---
 changelog/10447.bugfix.rst     |  1 +
 src/_pytest/mark/structures.py |  6 ++++--
 testing/test_mark.py           | 37 +++++++++++++++++++++++++++++++++-
 3 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 changelog/10447.bugfix.rst

diff --git a/changelog/10447.bugfix.rst b/changelog/10447.bugfix.rst
new file mode 100644
index 00000000000..5b3e29efd16
--- /dev/null
+++ b/changelog/10447.bugfix.rst
@@ -0,0 +1 @@
+When resolving marks from a class hierarchy MRO, reverse the order so that more basic classes' marks will be processed ahead of ancestral classes.
diff --git a/src/_pytest/mark/structures.py b/src/_pytest/mark/structures.py
index bc10d3b90ef..ce8e8c291e5 100644
--- a/src/_pytest/mark/structures.py
+++ b/src/_pytest/mark/structures.py
@@ -372,9 +372,11 @@ def get_unpacked_marks(
     """
     if isinstance(obj, type):
         if not consider_mro:
-            mark_lists = [obj.__dict__.get("pytestmark", [])]
+            mark_lists: Iterable[Any] = [obj.__dict__.get("pytestmark", [])]
         else:
-            mark_lists = [x.__dict__.get("pytestmark", []) for x in obj.__mro__]
+            mark_lists = reversed(
+                [x.__dict__.get("pytestmark", []) for x in obj.__mro__]
+            )
         mark_list = []
         for item in mark_lists:
             if isinstance(item, list):
diff --git a/testing/test_mark.py b/testing/test_mark.py
index e2d1a40c38a..2767260df8c 100644
--- a/testing/test_mark.py
+++ b/testing/test_mark.py
@@ -1130,6 +1130,41 @@ class C(A, B):
 
     all_marks = get_unpacked_marks(C)
 
-    assert all_marks == [xfail("c").mark, xfail("a").mark, xfail("b").mark]
+    assert all_marks == [xfail("b").mark, xfail("a").mark, xfail("c").mark]
 
     assert get_unpacked_marks(C, consider_mro=False) == [xfail("c").mark]
+
+
+# @pytest.mark.issue("https://github.com/pytest-dev/pytest/issues/10447")
+def test_mark_fixture_order_mro(pytester: Pytester):
+    """This ensures we walk marks of the mro starting with the base classes
+    the action at a distance fixtures are taken as minimal example from a real project
+
+    """
+    foo = pytester.makepyfile(
+        """
+        import pytest
+
+        @pytest.fixture
+        def add_attr1(request):
+            request.instance.attr1 = object()
+
+
+        @pytest.fixture
+        def add_attr2(request):
+            request.instance.attr2 = request.instance.attr1
+
+
+        @pytest.mark.usefixtures('add_attr1')
+        class Parent:
+            pass
+
+
+        @pytest.mark.usefixtures('add_attr2')
+        class TestThings(Parent):
+            def test_attrs(self):
+                assert self.attr1 == self.attr2
+        """
+    )
+    result = pytester.runpytest(foo)
+    result.assert_outcomes(passed=1)