Add test to ensure a removed state invalidates WS

tests/test_websocket.py

@@ -205,9 +205,7 @@ async def test_resume(test_cli_user):
 
     # try to resume
     conn = await gw_start(test_cli_user.cli)
-
-    # get the hello frame but ignore it
-    await _json(conn)
+    _ = await _json(conn)
 
     await _json_send(
         conn,
@@ -227,3 +225,30 @@ async def test_resume(test_cli_user):
     assert msg["op"] == OP.DISPATCH
     assert isinstance(msg["t"], str)
     assert msg["t"] in ("RESUMED", "PRESENCE_REPLACE")
+
+    # close again, and retry again, but this time by removing the state
+    # and asserting the session won't be resumed.
+    await _close(conn)
+
+    conn = await gw_start(test_cli_user.cli)
+    _ = await _json(conn)
+
+    async with test_cli_user.app.app_context():
+        test_cli_user.app.state_manager.remove(sess_id)
+
+    await _json_send(
+        conn,
+        {
+            "op": OP.RESUME,
+            "d": {
+                "token": test_cli_user.user["token"],
+                "session_id": sess_id,
+                "seq": 0,
+            },
+        },
+    )
+
+    msg = await _json(conn)
+    assert isinstance(msg, dict)
+    assert isinstance(msg["op"], int)
+    assert msg["op"] == OP.INVALID_SESSION