Add functional test demonstrating issue with type introspection

tests/functional/n/no/no_member_type_introspection.py

@@ -0,0 +1,56 @@
+"""Tests for no-member when type(self)() is returned by a method."""
+# pylint: disable=fixme,missing-class-docstring,missing-function-docstring,too-few-public-methods
+
+# Test for: https://github.com/PyCQA/pylint/issues/7464
+# TODO: the findings are false positives/negatives, see above link to issue.
+
+from . import no_member_type_introspection_base as ext
+
+
+class ExtBaseA(ext.Base):
+    def only_in_a(self):
+        pass
+
+
+class ExtBaseB(ext.Base):
+    def only_in_b(self):
+        pass
+
+
+a = ExtBaseA()
+new_a = a.return_type()
+new_a.only_in_a()
+new_a.only_in_b()  # [no-member]
+
+
+b = ExtBaseB()
+new_b = b.return_type()
+new_b.only_in_a()  # no-member false negative
+new_b.only_in_b()  # [no-member] false positive
+
+
+class Base:
+    def return_type(self):
+        return type(self)()
+
+
+class LocalBaseA(Base):
+    def only_in_a(self):
+        pass
+
+
+class LocalBaseB(Base):
+    def only_in_b(self):
+        pass
+
+
+a = LocalBaseA()
+new_a = a.return_type()
+new_a.only_in_a()  # [no-member] false positive
+new_a.only_in_b()  # [no-member]
+
+
+b = LocalBaseB()
+new_b = b.return_type()
+new_b.only_in_a()  # [no-member]
+new_b.only_in_b()  # [no-member] false positive

tests/functional/n/no/no_member_type_introspection.txt

@@ -0,0 +1,6 @@
+no-member:23:0:23:15::Instance of 'ExtBaseA' has no 'only_in_b' member; maybe 'only_in_a'?:INFERENCE
+no-member:29:0:29:15::Instance of 'ExtBaseA' has no 'only_in_b' member; maybe 'only_in_a'?:INFERENCE
+no-member:49:0:49:15::Instance of 'Base' has no 'only_in_a' member:INFERENCE
+no-member:50:0:50:15::Instance of 'Base' has no 'only_in_b' member:INFERENCE
+no-member:55:0:55:15::Instance of 'Base' has no 'only_in_a' member:INFERENCE
+no-member:56:0:56:15::Instance of 'Base' has no 'only_in_b' member:INFERENCE

tests/functional/n/no/no_member_type_introspection_base.py

@@ -0,0 +1,10 @@
+"""Tests for no-member when type(self)() is returned by a method."""
+# pylint: disable=missing-class-docstring,missing-function-docstring,too-few-public-methods
+
+
+# Test for: https://github.com/PyCQA/pylint/issues/7464
+
+
+class Base:
+    def return_type(self):
+        return type(self)()