Python: Add test-case with swapped decorator order

Author: RasmusWL

python/ql/test/library-tests/PointsTo/regressions/wrong/classmethod/Test.expected

@@ -3,3 +3,5 @@
 | test.py:17:15:17:17 | ControlFlowNode for cls | self instance of Foo |
 | test.py:22:15:22:17 | ControlFlowNode for cls | class Foo |
 | test.py:22:15:22:17 | ControlFlowNode for cls | self instance of Foo |
+| test.py:27:15:27:17 | ControlFlowNode for cls | class Foo |
+| test.py:27:15:27:17 | ControlFlowNode for cls | self instance of Foo |

python/ql/test/library-tests/PointsTo/regressions/wrong/classmethod/test.py

@@ -21,9 +21,15 @@ def problem_through_instance(cls):
     def problem_through_class(cls):
         check(cls) # same as above
 
+    @classmethod
+    @some_decorator
+    def also_problem(cls):
+        check(cls) # same as above
+
 # We need to call the methods before our analysis works
 f1 = Foo()
 f1.no_problem()
 f1.problem_through_instance()
+f1.also_problem()
 
 Foo.problem_through_class()