Add test case for issue microsoft#1301

src/ptvsd/_vendored/pydevd/_pydevd_bundle/pydevd_resolver.py

@@ -291,7 +291,6 @@ def get_contents_debug_adapter_protocol(self, dct, fmt=None):
             ret.append((key_as_str, val, '[%s]' % (eval_key_str,)))
             if i > MAX_ITEMS_TO_HANDLE:
                 ret.append((TOO_LARGE_ATTR, TOO_LARGE_MSG, None))
-
                 break
 
         ret.append(('__len__', len(dct), partial(_apply_evaluate_name, evaluate_name='len(%s)')))

tests/func/test_suspended_frames.py

@@ -0,0 +1,30 @@
+import sys
+from _pydevd_bundle.pydevd_constants import int_types
+from _pydevd_bundle.pydevd_resolver import MAX_ITEMS_TO_HANDLE
+
+def get_frame():
+    lst = {}
+    for idx in range(0, MAX_ITEMS_TO_HANDLE + 1):
+        lst[idx] = (1)
+    return sys._getframe()
+
+def test_get_child_variables():
+    from _pydevd_bundle.pydevd_suspended_frames import SuspendedFramesManager
+    suspended_frames_manager = SuspendedFramesManager()
+    py_db = None
+    with suspended_frames_manager.track_frames(py_db) as tracker:
+        # : :type tracker: _FramesTracker
+        thread_id = 'thread1'
+        frame = get_frame()
+        tracker.track(thread_id, frame, frame_id_to_lineno={})
+
+        assert suspended_frames_manager.get_thread_id_for_variable_reference(id(frame)) == thread_id
+
+        variable = suspended_frames_manager.get_variable(id(frame))
+
+        for x in variable.get_children_variables():
+            try:
+                x.get_children_variables()
+            except:
+                raise AssertionError()
+