add test to tracker store

tests/core/test_tracker_stores.py

@@ -614,6 +614,36 @@ async def test_sql_additional_events_with_session_start(domain: Domain):
         assert isinstance(additional_events[0], UserUttered)
 
 
+async def test_tracker_store_retrieve_ordered_by_id(
+    domain: Domain,
+):
+    tracker_store_kwargs = {"host": "sqlite:///"}
+    tracker_store = SQLTrackerStore(domain, **tracker_store_kwargs)
+    events = [
+        SessionStarted(timestamp=1),
+        UserUttered("Hola", {"name": "greet"}, timestamp=2),
+        BotUttered("Hi", timestamp=2),
+        UserUttered("How are you?", {"name": "greet"}, timestamp=2),
+        BotUttered("I am good, whats up", timestamp=2),
+        UserUttered("Ciao", {"name": "greet"}, timestamp=2),
+        BotUttered("Bye", timestamp=2),
+    ]
+    sender_id = "test_sql_tracker_store_events_order"
+    tracker = DialogueStateTracker.from_events(sender_id, events)
+    await tracker_store.save(tracker)
+
+    # Save other tracker to ensure that we don't run into problems with other senders
+    other_tracker = DialogueStateTracker.from_events("other-sender", [SessionStarted()])
+    await tracker_store.save(other_tracker)
+
+    # Retrieve tracker with events since latest SessionStarted
+    tracker = await tracker_store.retrieve(sender_id)
+
+    assert len(tracker.events) == 7
+    # assert the order of events is same as the order in which they were added
+    assert all((event == tracker.events[i] for i, event in enumerate(events)))
+
+
 @pytest.mark.parametrize(
     "tracker_store_type,tracker_store_kwargs",
     [(MockedMongoTrackerStore, {}), (SQLTrackerStore, {"host": "sqlite:///"})],
@@ -641,7 +671,7 @@ async def test_tracker_store_retrieve_with_session_started_events(
     # Retrieve tracker with events since latest SessionStarted
     tracker = await tracker_store.retrieve(sender_id)
 
-    assert len(tracker.events) == 2
+    assert len(tracker.events) == 3
     assert all((event == tracker.events[i] for i, event in enumerate(events[2:])))