Cypress.js: Assert that an XHR POST was successful.

cypress_xhr.js

describe('XHR form submission test', () => {
    before(() => {
        cy.server()
        cy.visit('/testurl')
    })
    it('successfully submits an XHR on form submission', () => {
        cy.get('[data-test="form"]').within(() => {
            cy.get('#test-input').type('spyfu.com')
            cy.route('POST', '/sumbit/here').as('postForm') // note that the route needs to match trailing slashes
            cy.get('button[type="submit"]').click()
                .wait('@postForm')
                .its('status').should('be', 200)
        }).then(() => {
            cy.get('[data-test="success-message"]').should('exist')
        })
    })
})