Add regression test for no-member of properties. Close #870

tests/functional/r/regression_property_no_member_870.py

@@ -0,0 +1,15 @@
+# pylint: disable=too-few-public-methods,invalid-name,missing-docstring
+# https://github.com/PyCQA/pylint/issues/870
+
+class X:
+    def __init__(self, val=None):
+        self._val = val
+    @property
+    def val(self):
+        return self._val
+    @val.setter
+    def val(self, value):
+        self._val = value
+
+if __name__ == '__main__':
+    print(X([]).val.append)