Add Python 3.8+ `asyncSetUp` to "defining-attr-methods" list (#8403) (#8438)

(cherry picked from commit b312b9a66472e17d02461258d2156d670481a7f6)

Co-authored-by: Samuel FORESTIER <HorlogeSkynet@users.noreply.github.com>

7 files changed, 30 insertions, 4 deletions

diff --git a/doc/user_guide/configuration/all-options.rst b/doc/user_guide/configuration/all-options.rst
index 13d67c280..2cbc3f483 100644
--- a/doc/user_guide/configuration/all-options.rst
+++ b/doc/user_guide/configuration/all-options.rst
@@ -626,7 +626,7 @@ Standard Checkers
 """""""""""""""""""""""
 *List of method names used to declare (i.e. assign) instance attributes.*
 
-**Default:**  ``('__init__', '__new__', 'setUp', '__post_init__')``
+**Default:**  ``('__init__', '__new__', 'setUp', 'asyncSetUp', '__post_init__')``
 
 
 --exclude-protected
@@ -663,7 +663,7 @@ Standard Checkers
    [tool.pylint.classes]
    check-protected-access-in-special-methods = false
 
-   defining-attr-methods = ["__init__", "__new__", "setUp", "__post_init__"]
+   defining-attr-methods = ["__init__", "__new__", "setUp", "asyncSetUp", "__post_init__"]
 
    exclude-protected = ["_asdict", "_fields", "_replace", "_source", "_make", "os._exit"]
 
diff --git a/doc/whatsnew/fragments/8403.false_positive b/doc/whatsnew/fragments/8403.false_positive
new file mode 100644
index 000000000..bfa34d17d
--- /dev/null
+++ b/doc/whatsnew/fragments/8403.false_positive
@@ -0,0 +1,5 @@
+Adds ``asyncSetUp`` to the default ``defining-attr-methods`` list to silence
+``attribute-defined-outside-init`` warning when using
+``unittest.IsolatedAsyncioTestCase``.
+
+Refs #8403
diff --git a/examples/pylintrc b/examples/pylintrc
index 70c5ff87c..16284083e 100644
--- a/examples/pylintrc
+++ b/examples/pylintrc
@@ -260,6 +260,7 @@ check-protected-access-in-special-methods=no
 defining-attr-methods=__init__,
                       __new__,
                       setUp,
+                      asyncSetUp,
                       __post_init__
 
 # List of member names, which should be excluded from the protected access
diff --git a/examples/pyproject.toml b/examples/pyproject.toml
index 1608d2cbb..f9a493c89 100644
--- a/examples/pyproject.toml
+++ b/examples/pyproject.toml
@@ -226,7 +226,7 @@ variable-naming-style = "snake_case"
 # check-protected-access-in-special-methods =
 
 # List of method names used to declare (i.e. assign) instance attributes.
-defining-attr-methods = ["__init__", "__new__", "setUp", "__post_init__"]
+defining-attr-methods = ["__init__", "__new__", "setUp", "asyncSetUp", "__post_init__"]
 
 # List of member names, which should be excluded from the protected access
 # warning.
diff --git a/pylint/checkers/classes/class_checker.py b/pylint/checkers/classes/class_checker.py
index bf0ab8ba6..e09df1706 100644
--- a/pylint/checkers/classes/class_checker.py
+++ b/pylint/checkers/classes/class_checker.py
@@ -778,7 +778,13 @@ class ClassChecker(BaseChecker):
         (
             "defining-attr-methods",
             {
-                "default": ("__init__", "__new__", "setUp", "__post_init__"),
+                "default": (
+                    "__init__",
+                    "__new__",
+                    "setUp",
+                    "asyncSetUp",
+                    "__post_init__",
+                ),
                 "type": "csv",
                 "metavar": "<method names>",
                 "help": "List of method names used to declare (i.e. assign) \
diff --git a/tests/functional/a/attribute_defined_outside_init_py38.py b/tests/functional/a/attribute_defined_outside_init_py38.py
new file mode 100644
index 000000000..7e93d1d29
--- /dev/null
+++ b/tests/functional/a/attribute_defined_outside_init_py38.py
@@ -0,0 +1,9 @@
+# pylint: disable=missing-docstring
+
+import unittest
+
+
+class AsyncioTestCase(unittest.IsolatedAsyncioTestCase):
+
+    async def asyncSetUp(self):
+        self.i = 42
diff --git a/tests/functional/a/attribute_defined_outside_init_py38.rc b/tests/functional/a/attribute_defined_outside_init_py38.rc
new file mode 100644
index 000000000..1bfb860e8
--- /dev/null
+++ b/tests/functional/a/attribute_defined_outside_init_py38.rc
@@ -0,0 +1,5 @@
+[main]
+load-plugins=pylint.extensions.typing
+
+[testoptions]
+min_pyver=3.8