code: def test_url_retrieval(self):
      # Shorten the URL to get its shortened form
      shortened_url = shorten_url("https://www.example.com")
  
      # Retrieve the original URL using the shortened URL directly
      retrieved_url = retrieve_url(shortened_url)
  
      self.assertEqual(
          retrieved_url,
          "https://www.example.com",
          "Retrieved URL does not match the original!",
      )
  
imports: import unittest
  from url_shortener import retrieve_url, shorten_url
label_desc: Use image node_id 1 for calling the TestURLShortener obj's underlying member method code with example usage: obj.test_url_retrieval() without return types