The example shows how to stop a test if it takes too long to execute, similar to Mocha's timeout option. The timeout function is in cypress/integration/timeout.js.
You can set timeout inside the test only, see cypress/integration/spec.js
// this test fails after two seconds due to timeout
it('does not finish long tests', () => {
testTimeout(2 * 1000)
cy.wait(10 * 1000)
})
You can set global timeout that applies to every test, see cypress/integration/all-tests-spec.js using Cypress.on('test:before:run' ... event