Add regression tests for Enum.name and .value inference (#4558)

Ref #1932. Ref #2062. Ref pylint-dev/astroid#1020.

ChangeLog

@@ -150,6 +150,12 @@ modules are added.
 
 * Fix error that occurred when using ``slice`` as subscript for dict.
 
+* Reduce false-positives around inference of ``.value`` and ``.name``
+  properties on ``Enum`` subclasses, following an upgrade in astroid
+
+  Closes #1932
+  Closes #2062
+
 
 What's New in Pylint 2.8.3?
 ===========================

tests/functional/e/enum_subclasses.py

@@ -0,0 +1,19 @@
+# pylint: disable=missing-docstring
+from enum import Enum, IntEnum
+
+
+class Issue1932(IntEnum):
+    """https://github.com/PyCQA/pylint/issues/1932"""
+    FOO = 1
+
+    def whats_my_name(self):
+        return self.name.lower()
+
+
+class Issue2062(Enum):
+    """https://github.com/PyCQA/pylint/issues/2062"""
+    FOO = 1
+    BAR = 2
+
+    def __str__(self):
+        return self.name.lower()