code: def test_register_command_ep():
      from dask.cli import _register_command_ep
  
      bad_ep = importlib_metadata.EntryPoint(
          name="bad",
          value="dask.tests.test_cli:bad_command",
          group="dask_cli",
      )
  
      good_ep = importlib_metadata.EntryPoint(
          name="good",
          value="dask.tests.test_cli:good_command",
          group="dask_cli",
      )
  
      class ErrorEP:
          @property
          def name(self):
              return "foo"
  
          def load(self):
              raise ImportError("Entrypoint could not be imported")
  
      with pytest.warns(UserWarning, match="must be instances of"):
          _register_command_ep(dummy_cli, bad_ep)
  
      with pytest.warns(UserWarning, match="exception ocurred"):
          _register_command_ep(dummy_cli, ErrorEP())
  
      _register_command_ep(dummy_cli, good_ep)
      assert "good" in dummy_cli.commands
      assert dummy_cli.commands["good"] is good_command
  
imports: from __future__ import annotations
  import json
  import platform
  import sys
  import click
  import importlib_metadata
  import pytest
  from click.testing import CliRunner
  import dask
  import dask.cli
label_desc: Use image node_id 11 for calling a global function with example usage: test_register_command_ep() and returns: str