code: def test_plots_diff_open_failed(
      tmp_dir, dvc, mocker, capsys, plots_data
  ):
      mocked_open = mocker.patch("webbrowser.open", return_value=False)
      cli_args = parse_args(
          ["plots", "diff", "--targets", "plots.csv", "--open"]
      )
      cmd = cli_args.func(cli_args)
      mocker.patch("dvc.repo.plots.diff.diff", return_value=plots_data)
  
      assert cmd.run() == 1
      expected_url = tmp_dir / "dvc_plots" / "index.html"
      mocked_open.assert_called_once_with(expected_url.as_uri())
  
      error_message = f"Failed to open {expected_url.as_uri()}. Please try opening it manually."
  
      out, err = capsys.readouterr()
      assert expected_url.as_uri() in out
      assert error_message in err
  
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 7 for calling a global function with example usage: test_plots_diff_open_failed(tmp_dir, dvc, mocker, capsys, plots_data) without return types