Read the blog post When can the test stop?
See the application in index.html that shows window.confirm on click
The cypress/e2e/spec.cy.js shows various ways the tests can ensure the async assertions finish before the test finishes. The last test shows how to use cypress-expect-n-assertions to automatically wait for declared number of assertions to run before finishing the test.
import { plan } from 'cypress-expect-n-assertions'
it('waits for planned number of assertion to run', () => {
plan(1)
cy.visit('index.html')
cy.on('window:confirm', (message) => {
expect(message).to.equal('Are you sure?')
})
cy.get('#click').click()
})
If the application code creates an unhandled rejected promise, Cypress does NOT see it by default. If you want to fail the test, listen to the unhandled promise event and throw an error. See spec file errors.cy.js
