intercept leaks between tests when combined with aliases

Current behavior

Using aliases in combination with intercept causes tests to interfere with other tests regularly.

Desired behavior

Intercept is cleaned up properly between tests.

Test code to reproduce

The below test will reproduce this. For me it reproduces it about 60% of the time. I can reproduce it 100% of the time in the closed source test where I encountered the issue, perhaps because it has a lot more assertions. I suppose it may depend on your hardware.

It seems that the error disappears if I clear cookies in afterEach.

const url = 'https://www.cypress.io/'
const dummyRequest = () =>
  cy.request({
    url,
  })

context('InterceptBug', () => {
  beforeEach(() => {
    dummyRequest().as('home')
    cy.visit(url)
  })
  // afterEach(() => {
  //   cy.clearCookies()
  // })

  it('shows the logo', () => {
    cy.get('[alt="Cypress.io"]').should('exist')
  })
  const navigate = () => {
    cy.get('[alt="Cypress.io"]').should('exist')

    // The second time this is called, this sometimes triggers an additional
    // error: `Cannot read property 'fireChangeEvent' of undefined`
    // Other times it will fail on the previous selector with the (assert)
    // error: `expected undefined to exist`
    // I figured those are different bugs, so consider them out of scope for
    // this issue.
    cy.intercept(url).as('navigation')

    cy.contains('Features').click({
      force: true,
    })

    cy.wait('@navigation')

    // If the below visit is removed the test should succeed most of the time
    cy.visit(url)
  }
  it('allows navigating', navigate)
  it('allows navigating2 very irregularly fails', navigate)
  const useHomeAlias = () => {
    cy.get<string>('@home').then((response) => {
      // do something with response
      dummyRequest()
    })
  }
  // cy.get() could not find a registered alias for: @home.
  // You have not aliased anything yet.
  it('use home alias fails', useHomeAlias)
  it('use home alias succeeds', useHomeAlias)
})

export {}

Versions

Cypress version 6.0.0, N/A, Chrome 87, macOS Catalina, N/A

Possibly related issues:

• https://github.com/cypress-io/cypress/issues/8926
• https://github.com/cypress-io/cypress/issues/9170
• https://github.com/cypress-io/cypress/issues/9406

[jennifer-shehane]

I can’t always get the tests to fail, but it pretty reliably fails with the example below. I could never get the allows navigating2 very irregularly fails test to fail, so if you have a simpler example of this, please provide it or open a new issue.

I’m not totally sure this is related to intercept exactly, it seems like a combination of things are involved.

Reproducible Example

The ‘use home alias fails’ test doesn’t seem to be running the beforeEach hook.

context('InterceptBug', () => {
  beforeEach(() => {
    cy.request({
      url: 'https://www.cypress.io/',
    }).as('home')
    cy.visit('https://www.cypress.io/')
  })

  it('allows navigating', () => {
    cy.get('[alt="Cypress.io"]')
    cy.intercept('https://www.cypress.io/')
  })

  // cy.get() could not find a registered alias for: @home.
  // You have not aliased anything yet.
  it('use home alias fails', () => {
    cy.get('@home')
  })

  it('use home alias succeeds', () => {
    cy.get('@home')
  })
})

[jennifer-shehane]

This has been resolved and is no longer present in our most recent version - 6.2.1