text: """Tests for the latex preprocessor"""
  
  # Copyright (c) IPython Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  from unittest.mock import patch
  
  import pytest
  
  from ..webpdf import WebPDFExporter
  from .base import ExportersTestsBase
  
  
  class TestWebPDFExporter(ExportersTestsBase):
      """Contains test functions for webpdf.py"""
  
      exporter_class = WebPDFExporter
  
      @pytest.mark.network
      def test_export(self):
          """
          Can a TemplateExporter export something?
          """
          (output, resources) = WebPDFExporter(allow_chromium_download=True).from_filename(
              self._get_notebook()
          )
          assert len(output) > 0
  
      @patch("pyppeteer.util.check_chromium", return_value=False)
      def test_webpdf_without_chromium(self, mock_check_chromium):
          """
          Generate PDFs if chromium not present?
          """
          with pytest.raises(RuntimeError):
              WebPDFExporter(allow_chromium_download=False).from_filename(self._get_notebook())
  
      def test_webpdf_without_pyppeteer(self):
          """
          Generate PDFs if chromium not present?
          """
          with pytest.raises(RuntimeError):
              exporter = WebPDFExporter()
              with open(self._get_notebook(), encoding="utf-8") as f:
                  nb = exporter.from_file(f, resources={})
                  # Have to do this as the very last action as traitlets do dynamic importing often
                  with patch("builtins.__import__", side_effect=ModuleNotFoundError("Fake missing")):
                      exporter.from_notebook_node(nb)
  