title: Cypress, how to check property exists
body: <p>I'm new to cypress and am trying a couple of different methods to get a checkbox property...</p>
  <pre><code>checkBox().should('have.prop', 'checked')
  checkBox().its('checked').should('exist')
  </code></pre>
  <p>The first line works fine but I was expecting the second to also pass but I get a &quot;expected Undefined to exist&quot; response.</p>
  <p>Thanks</p>