How to make Cypress test fail if it makes a request that does not have an intercept associated with it?

Let's say cypress navigates to a page and makes 10 requests. How can I make cypress automatically fail if any of those requests are not intercepted. I don't want any requests made from cypress to NOT be mocked.

Is this possible?

Solution

If you want to check the cy.intercept() coverage of app requests, add a middleware intercept.

Generally you want the middleware to catch a broad range of URL's, for example all the API calls would be caught with

cy.intercept('**/api/**/*')

Middleware intercepts always see the captured calls first, and then pass them on to remaining intercepts.

This example checks the GET calls during loading of https://cypress.io/.

cy.intercept('https://www.cypress.io/_astro/**/*') // the intercept in my test
                                                   // want to check for unhandled calls

// Middleware intercept - catches all calls
const calls = []
cy.intercept('https://www.cypress.io/**/*', { middleware: true }, (req) => {
  calls.push(req.url)
}).as('all')

cy.visit('https://cypress.io/')    // now visit the site

cy.then(() => {

  // Use routes state info to compare handled calls vs all calls
  const handledUrls = Object.values(cy.state('routes'))
    .filter(route => route.alias !== 'all')
    .map(route => Object.values(route.requests)
      .map(interceptedRequest => interceptedRequest.request.url)
    })
    .flat()

  // Find the unhandled calls
  const unhandled = calls.filter(call => !handledUrls.includes(call))
  console.log('Unhandled calls: ', unhandled)

})

Logs two unhandled calls:

[
  'https://www.cypress.io/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js', 
  'https://www.cypress.io/videos/home_page.webm'
]