How to stub Inertia requests on Cypress?

[MtDalPizzol]

Hi, folks... I have just hit a problem trying to test my Laravel + Vue with Cypress.

I have a controller method that return back()->withErrors([ 'custom_error' => 'yadayadayada']);

In order to test a failure scenario in that controller, I thought of stubbing that request in Cypress. with server and route to mimic a Inertia redirect response. Something in these lines:

cy.server()

cy.route({
    method: 'POST',
    url: '/user-consent',
    status: 302,
    headers: {
        location: 'http://localhost/'
    }
})

The problem here, clearly, is that stubbing the request prevents Cypress from hitting the Laravel server and, therefore, from flashing the errors to the session, causing the http://localhost/ to be rendered normally, with no errors. This makes testing for an error scenario impossible if the app is written in the "Inertia way".

So... Is there a recommendation on how to handle this?

The only workaround I came up with is not to return back()->withErrors() and instead just abort(400, 'yadayadayada') and handle it in the old "Axios way". This would allow me to automatize my tests, but my code would become a weird mix of "Inertia and Axios" responses.

[plweil]

@MtDalPizzol Did you ever figure out how to handle this?