Setting testIsolation: "legacy" for specific describe blocks?

[marmite22]

I'm migrating some old Cypress tests and in the process of upgrading have enabled experimentalSessionAndOrigin. Most of the tests are fine with this but there are few tricky to refactor tests that would greatly benefit from having the legacy behaviour.

It seems from the docs that I should be able to set the testIsolation to legacy in the Describe block but I've been unable to get it working.

describe('testing session', { "testIsolation": "legacy" }, () => {

This is what I'm trying and the first it() block passes. The second however errors with "CypressError: The testIsolation configuration can only be overridden from a suite-level override."

So is it possible to set the testIsolation for just some tests?

[emilyrohrbough]

@marmite22 The can only be set at the suite (describe) level, not at a test-level. Can you share psudeo-code of your test structure that is having issues?

[marmite22]

I'm afraid I'm totally lost as to what "testIsolation": "legacy" is supposed to do then. I thought it would prevent Cypress from navigating to about:blank at the start of each it() block. Is that not the case?

What I'm trying to get to is a point where some (most) describe block use the new session command and will completely reset between it() blocks but I have a few legacy describe blocks that are hard to refactor to work in that way and on those few tests I would like to still use the old behaviour (where if I don't call visit, the test picks up from where the previous one left off).

[marmite22]

And setting testIsolation at the describe level like this describe('testing session', {testIsolation: 'legacy'}, () => { doesn't work because as soon as it hits a second it() block I get the error CypressError: The testIsolation configuration can only be overridden from a suite-level override.

[emilyrohrbough]

I thought it would prevent Cypress from navigating to about:blank at the start of each it() block. Is that not the case?

It does prevent navigating to about:about blank before each test. The logic in cy.session() command will navigate to about:blank and the testIsolation configuration does not change the behavior of the command.

I was able to repo the issue you are seeing where the 2nd test is throwing. Logged #23644 to report the details. Thank you for this find! You must be one of the first people to opt-in to just be finding this after a few releases.

[marmite22]

Thanks for your speed in getting back to me. I'll keep an eye on that ticket.

[emilyrohrbough]

Released in 10.8.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v10.8.0, please open a github issue.

[emilyrohrbough]

#23644 was released in 10.8.0.

This comment thread has been locked. If you are still experiencing this issue after upgrading to
Cypress v10.8.0, please open a github issue.