Update regression tests for pylint-dev/astroid#940 (#4466)

* Fix Enum.__member__ regression tests

Ref pylint-dev/astroid#940. These tests failed after fixing inference of
Enum.__members__ due to unexpected "not-iterable" warnings raised. These
warnings were not false-positives, as the test definition would have
raised TypeError at runtime: .keys and .values on dict/mappingproxy
are not properties, but methods.

* Update _emit_no_member to ignore abstract properties
* Update changelog and contributors

CONTRIBUTORS.txt

@@ -482,3 +482,5 @@ contributors:
 * das-intensity: contributor
 
 * Jiajunsu (victor): contributor
+
+* Andrew Haigh (nelfin): contributor

ChangeLog

@@ -31,6 +31,8 @@ Release date: TBA
 * Stdlib deprecated modules check is moved to stdlib checker. New deprecated
 modules are added.
 
+* Fix raising false-positive ``no-member`` on abstract properties
+
 
 What's New in Pylint 2.8.2?
 ===========================

pylint/checkers/typecheck.py

@@ -458,7 +458,9 @@ def _emit_no_member(node, owner, owner_name, ignored_mixins=True, ignored_none=T
         return False
     if owner_name and ignored_mixins and owner_name[-5:].lower() == "mixin":
         return False
-    if isinstance(owner, astroid.FunctionDef) and owner.decorators:
+    if isinstance(owner, astroid.FunctionDef) and (
+        owner.decorators or owner.is_abstract()
+    ):
         return False
     if isinstance(owner, (astroid.Instance, astroid.ClassDef)):
         if owner.has_dynamic_getattr():

tests/functional/m/member/member_checks.py

@@ -227,7 +227,7 @@ class Animal(Enum):
 # To test false positive no-member on Enum.__members__.items()
 for itm in Animal.__members__.items():
     print(itm)
-for keyy in Animal.__members__.keys:
+for keyy in Animal.__members__.keys():  # pylint: disable=consider-iterating-dictionary
     print(keyy)
-for vall in Animal.__members__.values:
+for vall in Animal.__members__.values():
     print(vall)