describe.only() does not work when string is the same as another describe() block

[c32hedge]

Current behavior:

If you have multiple describe blocks with the same description string, marking one of them with describe.only will run all describe blocks with the same description instead of just the one with .only:

Desired behavior:

Marking a describe block with .only should "only" run that describe block, not others with the same description.

Steps to reproduce: (app code and test code)

Run the following spec:

describe('outer describe', () => {
  describe('inner describe', () => {
    it('works', () => {});
  });

  describe.only('inner describe', () => {
    it('works again', () => {});
  });

  describe('unique name', () => {
    it('still works', () => {});
  });

  describe('inner describe', () => {
    it('works yet again', () => {});
  });
});

Instead of just running one test with the description "works again", three tests are executed, in all three describe('inner describe'...) blocks.

Versions

Cypress 3.4.1
Ubuntu 18.04
Chrome 77

[c32hedge]

It's worth noting that Mocha itself used to have this issue (see mochajs/mocha#1834, fixed by mochajs/mocha#1807).

[jennifer-shehane]

Cypress uses a Mocha version 2.5.3, this is fixed in later versions. Going to close this as a duplicate of #2528 - which will be released in Cypress 4.0.0 release.

[c32hedge]

Wow, so Cypress is still on a version that's over three years old 😱

[jennifer-shehane]

I've confirmed that this will be fixed in upcoming 4.0 release.

[flotwig]

Released in 4.0.0.