title: How to assert the values in a downloaded file using Cypress
body: <p>I am downloading a zip file which has a json zipped. Using cy.readfile, I am able to read the content but I am not sure what commands can be used to assert on the values inside. 
  (Please let me know if there is a way to unzip the file before reading)
  I need to verify I have 3 objectids present in the json and also some values of the elements.
  I tried the below approach, but it did not work.</p>
  
  <pre class="lang-js prettyprint-override"><code>cy.readFile(`/Users/${username}/Downloads/${fileName}.zip`) 
    .should('contain','objectid').and('have.length',3); 
  </code></pre>
  
  <p>The above command did not work for me :(</p>
  
  <p>Could someone help me with some examples? I am new to cypress and coding,therefore struggling a little.
  <a href="https://i.stack.imgur.com/wE5oN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wE5oN.png" alt="Attaching an image of how cy.readfile of the zip file looks like. As highlighted in the image, I need to assert on having 2 objectid&#39;s present in the file and some other values as well. "></a></p>