Check if an error has been written to the console

Question

I\'m trying to find a way to check if an error has been written to the console when running a cypress unit test.

I know how to log something to the console

Answer 1

There have been some updates since the previous answers.

Because the window is re-created with each cy.visit, Cypress recommends stubbing as a part of the cy.visit command.

cy.visit('/', {
  onBeforeLoad(win) {
    cy.stub(win.console, 'log').as('consoleLog')
    cy.stub(win.console, 'error').as('consoleError')
  }
})

//...
cy.get('@consoleLog').should('be.calledWith', 'Hello World!')
cy.get('@consoleError').should('be.calledOnce')

For more details see the official FAQ for stubbing out the console: https://docs.cypress.io/faq/questions/using-cypress-faq.html#How-do-I-spy-on-console-log

And the recipe repository: https://github.com/cypress-io/cypress-example-recipes/tree/master/examples/stubbing-spying__console