Add regression tests of properties on derived classes

Ref pylint-dev/astroid#940

tests/functional/r/regression/regression_properties_in_class_context.py

@@ -0,0 +1,44 @@
+# pylint: disable=missing-docstring,too-few-public-methods
+
+class Meta(type):
+    @property
+    def values(cls):
+        return ['foo', 'bar']
+
+
+class Parent(metaclass=Meta):
+    pass
+
+
+assert 'foo' in Parent.values  # no warning
+for value in Parent.values:  # no warning
+    print(value)
+
+
+class Child(Parent):
+    pass
+
+
+assert 'foo' in Child.values  # false-positive: unsupported-membership-test
+for value in Child.values:  # false-positive: not-an-iterable
+    print(value)
+
+
+class Meta2(type):
+    def a_method(cls):  # pylint: disable=no-self-use
+        return [123]
+
+
+class Parent2(metaclass=Meta2):
+    @property
+    def a_method(self):
+        return "actually a property"
+
+
+class Child2(Parent2):
+    pass
+
+
+assert 123 in Child2.a_method  # [unsupported-membership-test]
+for value in Child2.a_method:  # [not-an-iterable]
+    print(value)

tests/functional/r/regression/regression_properties_in_class_context.txt

@@ -0,0 +1,2 @@
+unsupported-membership-test:42:14::Value 'Child2.a_method' doesn't support membership test
+not-an-iterable:43:13::Non-iterable value Child2.a_method is used in an iterating context