code: def test_plots_diff_open(
      tmp_dir, dvc, mocker, capsys, plots_data, auto_open
  ):
      mocked_open = mocker.patch("webbrowser.open", return_value=True)
  
      args = ["plots", "diff", "--targets", "plots.csv"]
  
      if auto_open:
          with dvc.config.edit() as conf:
              conf["plots"]["auto_open"] = True
      else:
          args.append("--open")
  
      cli_args = parse_args(args)
      cmd = cli_args.func(cli_args)
      mocker.patch("dvc.repo.plots.diff.diff", return_value=plots_data)
  
      index_path = tmp_dir / "dvc_plots" / "index.html"
      mocker.patch("dvc_render.render_html", return_value=index_path)
  
      assert cmd.run() == 0
      mocked_open.assert_called_once_with(index_path.as_uri())
  
      out, _ = capsys.readouterr()
      assert index_path.as_uri() in out
  
imports: import json
  import os
  import posixpath
  from pathlib import Path
  import pytest
  from funcy import set_in
  from dvc.cli import parse_args
  from dvc.commands.plots import CmdPlotsDiff, CmdPlotsShow, CmdPlotsTemplates
  from dvc.render.match import RendererWithErrors
  from dvc.utils.serialize import YAMLFileCorruptedError
label_desc: Use image node_id 5 for calling a global function with example usage: test_plots_diff_open(tmp_dir, dvc, mocker, capsys, plots_data, auto_open) without return types