Multiple test blocks are running despite .only

[bahmutov]

Issue in bahmutov/effective-e2e-testing-with-cypress#1 code in https://github.com/bahmutov/effective-e2e-testing-with-cypress/tree/double-only

I think this is because one block has title that is substring of another block

Current behavior:

describe.only('main features', function () {
  it('first spec', function () {})
})

describe('main features with assertions', function () {
  it('second spec', function () {})
})

Runs both blocks despite .only

Desired behavior:

Run only the block with describe.only

How to reproduce:

Clone repo, grab branch double-only, open Cypress

Additional Info (images, stack traces, etc)

• Operating System: Mac
• Cypress Version: 0.20.0
• Browser Version: Electron

[zukoaang]

I have the same issue.
Did you ever solve this?
Hasn't anyone responded here?

[brian-mann]

This is mocha's default behavior in the version we are using. It is to be expected.

[zukoaang]

@brian-mann
So do you mean that in the Mocha's version you're using, the .only just isn't supported?
That was not expected at all.
Is that intentional?
Will it be changed?

[kuceb]

@zukoaang it seems to be a bug in mocha mochajs/mocha#1481

[brian-mann]

@zukoaang We are on an older version of mocha that will match suites and tests by a regexp. When you put an .only on one of them - if other suites and tests match that title they will run as well.

In later versions they fixed this. We'd need to upgrade to get access to that functionality. We have deep, deep integrations into mocha so upgrading for us isn't a simple npm install.

The good news is that we've recently talked about doing this so this would "just work" when we do the next upgrade.

In the mean time, simply make your titles different enough and you won't see multiple tests and suites run when using an .only

[jennifer-shehane]

I've verified that this will be fixed from #2703 - our Mocha update PR.

The code for this is done, but this has yet to be released. We'll update this issue and reference the changelog when it's released.

[jennifer-shehane]

Released in 4.0.0