Python: Add points-to regression for metaclass

Author: RasmusWL

python/ql/test/library-tests/PointsTo/regressions/missing/metaclass/getACall.expected

@@ -0,0 +1 @@
+| test.py:6:5:6:22 | Function Foo.foo | test.py:9:1:9:11 | ControlFlowNode for Attribute() |

python/ql/test/library-tests/PointsTo/regressions/missing/metaclass/getACall.ql

@@ -0,0 +1,4 @@
+import python
+
+from PythonFunctionValue func
+select func, func.getACall()

python/ql/test/library-tests/PointsTo/regressions/missing/metaclass/test.py

@@ -0,0 +1,25 @@
+# Simple classmethod
+
+class Foo(object):
+
+    @classmethod
+    def foo(cls, arg):
+        print(cls, arg)
+
+Foo.foo(42)
+
+
+# classmethod defined by metaclass
+
+class BarMeta(type):
+
+    def bar(cls, arg):
+        print(cls, arg)
+
+class Bar(metaclass=BarMeta):
+    pass
+
+Bar.bar(42) # TODO: No points-to
+
+# If this is solved, please update python/ql/src/Variables/UndefinedExport.ql which has a
+# work-around for this behavior