old_contents: from __future__ import print_function
  
  import os
  import pytest
  from os.path import join
  import sys
  import unittest
  import subprocess
  
  if sys.platform == "win32":
      GULP = "gulp.cmd"
  else:
      GULP = "gulp"
  
  @pytest.mark.js
  class TestBokehJS(unittest.TestCase):
  
      def test_bokehjs(self):
          os.chdir('bokehjs')
          proc = subprocess.Popen([join('node_modules', '.bin', GULP), "test"],
                                  stdout=subprocess.PIPE)
          out, errs = proc.communicate()
          msg = out.decode('utf-8', errors='ignore')
          print(msg)
          if proc.returncode != 0:
              assert False
  
  if __name__ == "__main__":
      unittest.main()
  
new_contents: from __future__ import print_function
  
  import os
  import pytest
  from os.path import join
  import sys
  import unittest
  import subprocess
  
  if sys.platform == "win32":
      GULP = "gulp.cmd"
  else:
      GULP = "gulp"
  
  @pytest.mark.js
  class TestBokehJS(unittest.TestCase):
  
      def test_bokehjs(self):
          os.chdir('bokehjs')
          proc = subprocess.Popen([join('node_modules', '.bin', GULP), "test"],
                                  stdout=subprocess.PIPE)
          out, errs = proc.communicate()
          msg = out.decode('utf-8', errors='ignore')
          os.chdir('..')
          print(msg)
          if proc.returncode != 0:
              assert False
  
  if __name__ == "__main__":
      unittest.main()
  
subject: Update test_bokehjs.py (#5281)