Test Autocomplete for BECIpython client

There should be test for autocompletion for related to gui. Example (do not work with current implementation):

import copy
import subprocess
import sys

import pytest
import yaml
from bec_ipython_client import main
from bec_lib.service_config import DEFAULT_SERVICE_CONFIG


@pytest.fixture
def service_config(tmpdir, bec_client_lib):
    config = copy.deepcopy(DEFAULT_SERVICE_CONFIG)
    port = bec_client_lib._service_config.redis.split(":")[-1]
    config["redis"]["port"] = port
    with open(tmpdir / "config.yaml", "w") as f:
        yaml.dump(config, f)
    return tmpdir / "config.yaml"


def test_cli_gui_autocompletion(tmpdir, service_config):
    file_to_execute = tmpdir / "post_startup.py"
    with open(file_to_execute, "w") as f:
        f.write(
            """
try:
  completer=get_ipython().Completer
  import sys
  fig.plot([1,2,3], [1,2,3])
  dock = bec.gui.panels["default_figure"]
  print(completer.all_completions('gui.pane'), flush=True)
  print(completer.all_completions('gui.panels["default_figure"].wid'), flush=True)
  print(completer.all_completions('gui.panels["default_figure"].widget_list[0].pl'), flush=True)
  print(completer.all_completions('dock.atta'), flush=True)
  print(completer.all_completions('fig.widget_list[0].cu'), flush=True)
  print(completer.all_completions('fig.widget_list[0].curves[0].set_co'), flush=True)
  
finally:
  import os
  import signal
  gui.close()
  os.kill(os.getpid(), signal.SIGTERM)
  
"""
        )
    p = subprocess.Popen(
        [
            sys.executable,
            main.__file__,
            "--config",
            service_config,
            "--post-startup-file",
            file_to_execute,
        ],
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        text=True,
    )
    output, _ = p.communicate()
    assert "gui" in output
    assert "panels" in output
    assert "widget_list" in output
    assert "plot" in output
    assert "attach" in output
    assert "curves" in output
    assert "set_color" in output