update xhr test a little

Author: bahmutov

cypress/component/component tests/basic/network/users-spec.js

@@ -28,6 +28,8 @@ context('Users', () => {
  cy.wait('@users')
  .its('response.body')
  .should('have.length', 3)
+ .its('0')
+ .should('include.keys', ['id', 'name', 'username', 'email'])
  })
 
  it('can display mock XHR response', () => {