docs: def setup(api=None):
      """Sets up and fills test directory for serving.
  
      Using different filetypes to see how they are dealt with.
      The tempoary directory will clean itself up.
      """
      global tmp_dir_object
  
      tmp_dir_object = tempfile.TemporaryDirectory()
  
      dir_name = tmp_dir_object.name
  
      dir_a = os.path.join(dir_name, "a")
      os.mkdir(dir_a)
      dir_b = os.path.join(dir_name, "b")
      os.mkdir(dir_b)
  
      # populate directory a with text files
      file_list = [
              ["hi.txt", """Hi World!"""],
              ["hi.html", """<strong>Hi World!</strong>"""],
              ["hello.html", """
                  <img src='/static/b/smile.png'</img>
                  pop-up
                  <script src='/static/a/hi.js'></script>"""],
              ["hi.js", """alert('Hi World')""" ]
      ]
  
      for f in file_list:
          with open(os.path.join(dir_a, f[0]), mode="wt") as fo:
              fo.write(f[1])
  
      # populate directory b with binary file
      image = b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\n\x00\x00\x00\n\x08\x02\x00\x00\x00\x02PX\xea\x00\x00\x006IDAT\x18\xd3c\xfc\xff\xff?\x03n\xc0\xc4\x80\x170100022222\xc2\x85\x90\xb9\x04t3\x92`7\xb2\x15D\xeb\xc6\xe34\xa8n4c\xe1F\x120\x1c\x00\xc6z\x12\x1c\x8cT\xf2\x1e\x00\x00\x00\x00IEND\xaeB`\x82'
  
      with open(os.path.join(dir_b, "smile.png"), mode="wb") as fo:
              fo.write(image)