Python: Extend isSequence/isMapping test with custom classes

python/ql/test/library-tests/PointsTo/class_properties/ClassValues.expected

@@ -1,3 +1,4 @@
+| mapping | class MySequenceImpl |
 | neither sequence nor mapping | builtin-class set |
 | sequence | builtin-class bytes |
 | sequence | builtin-class collections.OrderedDict |
@@ -6,4 +7,7 @@
 | sequence | builtin-class list |
 | sequence | builtin-class str |
 | sequence | builtin-class tuple |
+| sequence | class MyDictSubclass |
+| sequence | class MyMappingABC |
+| sequence | class MySequenceABC |
 | sequence | class OrderedDict |

python/ql/test/library-tests/PointsTo/class_properties/test.py

@@ -4,15 +4,35 @@ import collections.abc
 def test(*args):
     pass
 
+class MySequenceABC(collections.abc.Sequence):
+    pass
+
+class MyMappingABC(collections.abc.Mapping):
+    pass
+
+class MySequenceImpl(object):
+    def __getitem__(self, key):
+        pass
+
+    def __len__(self):
+        pass
+
+class MyDictSubclass(dict):
+    pass
+
 test(
     list,
     tuple,
     str,
     bytes,
+    MySequenceABC,
+    MySequenceImpl,
     set,
     dict,
     OrderedDict,
     defaultdict,
+    MyMappingABC,
+    MyDictSubclass,
 )
 
 for seq_cls in (list, tuple, str, bytes):