code: def test_all_status_messages(self, connect):
      with gr.Blocks() as demo:
          name = gr.Textbox()
          output = gr.Textbox()
  
          def greet(x):
              time.sleep(2)
              return f"Hello, {x}!"
  
          name.submit(greet, name, output, concurrency_limit=2)
  
      app, local_url, _ = demo.launch(prevent_thread_lock=True)
      test_client = TestClient(app)
      client = grc.Client(local_url)
  
      client.submit("a", fn_index=0)
      job2 = client.submit("b", fn_index=0)
      client.submit("c", fn_index=0)
      job4 = client.submit("d", fn_index=0)
  
      sizes = []
      while job4.status().code.value != "FINISHED":
          queue_status = test_client.get("/queue/status").json()
          queue_size = queue_status["queue_size"]
          if len(sizes) == 0 or queue_size != sizes[-1]:
              sizes.append(queue_size)
          time.sleep(0.01)
  
      time.sleep(0.1)
      queue_status = test_client.get("/queue/status").json()
      queue_size = queue_status["queue_size"]
      if queue_size != sizes[-1]:
          sizes.append(queue_size)
  
      assert max(sizes) in [
          2,
          3,
          4,
      ]  # Can be 2 - 4, depending on if the workers have picked up jobs before the queue status is checked
  
      assert min(sizes) == 0
      assert sizes[-1] == 0
  
      assert job2.result() == "Hello, b!"
      assert job4.result() == "Hello, d!"
  
file_path: gradio/test/test_queueing.py
imports: import time
  from concurrent.futures import wait
  import gradio_client
  import pytest
  from fastapi.testclient import TestClient
  import gradio
label_desc: Use image node_id 2 for calling the TestQueueing obj's underlying member method code with example usage: obj.test_all_status_messages(connect) and returns: str, x, str