Fixture files defined in cy.route with fx and fixture shortcut take longer to load, sometimes timeout.

[SurjithP]

Current behavior:

cy.route('GET', `**/test/**`, `fixture:test.json`).as('something');

error :

Error:    CypressError: `cy.fixture()` timed out waiting `30000ms` to receive a fixture. No fixture was ever sent by the server.Desired behavior: the file is in the fixture folder and it should be taken, this was working in 4.11.0 Versions The issue is newer version 4.12.0

[jennifer-shehane]

The code around the fixture shortcut was updated in 4.12.0, so that it should now throw a descriptive error if the file specified is not found in the location given - this would be unexpected behavior if this other error is being shown. #7818

I'm not able to reproduce this behavior from the information given. Please provide a repo or more code to reproduce the issue. Maybe it is dependent on the content in your json file - or if you have a cy.wait() later defined waiting on the alias. We'd love to fix this if there's a regression.

My code that does not fail

cypress/integration/spec.js

it('test', () => {
  cy.server()
  cy.route('GET', `**/test/**`, `fixture:test.json`).as('something')
})

it('test2', () => {
  cy.visit('https://example.cypress.io/commands/files')
  cy.server()
  cy.route('GET', 'comments/*', 'fixture:test.json').as('getComment')
  cy.get('.fixture-btn').click()
  cy.wait('@getComment')
})

cypress/fixtures/test.json

{}

[SurjithP]

@jennifer-shehane
If this was my code issue, how that worked in 4.11.0 and earlier versions. Json file is the fixture folder and content is same as before. nothing was changed, but after the cypress update it started failing

Console error :

[jennifer-shehane]

Yes, I believe that you may be encountering an error in 4.12.0. I need the exact code to run to reproduce it - as shown above, I'm not able to reproduce with the information given alone.

The cy.route() command does not log to the Command Log in the Test Runner, but I see in your screenshot that this is logging. Have you overwritten the cy.route() command somewhere in your project using Cypress.Commands.overwrite?

Please provide a full example so that we can begin work on fixing the issue. We will have to close this issue without this - since we will not have a path to move forward.

[SurjithP]

@jennifer-shehane , I can understand, but I can't provide my repo details to you. we do not overwrite any inbuild cypress commands, only our custom things are doing like that.
I just tried the same test in version 4.11.o Its green

in 4.12.0 , test failing in this line

[jennifer-shehane]

You'll need to revert to Cypress 4.11.0 for now then.

Unfortunately we can't work on fixing this possible regression without a clear example given on how to reproduce the issue.

[SurjithP]

@jennifer-shehane , Ok. One doubt , is there is any file size limit or any new json validation added in version 4.12.0 ?
my file is little lengthy

[jennifer-shehane]

How large is your file? I tried this with a 1,400kb JSON file and it is not erroring with my example above.

Are you positive that this fixture file exists? Previously, in 4.11.0, this would silently pass - not warning you that the file does not exist. We fixed this error, but it should show a better error than you're seeing if that is the case.

[SurjithP]

@jennifer-shehane it was a file size issue, my file was the size of more than 8MB. Removed some content in the file, now it works. Can you please provide the max file size?

[jennifer-shehane]

I am able to recreate this sometimes with a JSON file that is 11mb in size. Sometimes it takes longer than 30seconds to load. I can recreate this below - with a lower timeout.

it('test', () => {
  cy.server()
  Cypress.config('responseTimeout', 5000)
  cy.route('GET', 'test', 'fixture:large_11mb.json')
})

You could increase the global responseTimeout to increase the time allowed to fetch this fixture, but since this is increasing the runtime it'd probably be best to just downgrade to 4.11.0.

This issue was introduced in 4.12.0. When downgrading - the file instantly resolves.

4.11.0

Only took 0.02 seconds to run test

4.12.0

Takes longer than 10 seconds, sometimes longer than 30 seconds (which is default timeout).

[cypress-bot]

The code for this is done in cypress-io/cypress#8215, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 5.0.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v5.0.0, please open a new issue.