Jest: Stored snapshots can't be found on CI only

[StarpTech]

🐛 Bug Report

Snapshots can't be found on CI even when snapshots are checked in the source control.

  ● Attributes
    expect(value).toMatchSnapshot()
    New snapshot was not written. The update flag must be explicitly passed to write a new snapshot.
    This is likely because this test is run in a continuous integration (CI) environment in which snapshots are not written by default.

To Reproduce

https://travis-ci.org/Prettyhtml/prettyhtml/jobs/436540742

Jest version: 23.6.0

Expected behavior

Tests should work as locally because all my snapshots are checked in the source control.

[StarpTech]

The issue could be identified. The test pattern matched the tests inside the production build and in the test directory :smile:

[SimenB]

Is this something jest could have detected and warned about?

[StarpTech]

I don't think so because the directory structure isn't fixed. We could print a warning when someone is trying to run snapshot tests in a directory like dist, build which won't usually contain fixtures.

[joaoeudes7]

Any news as a correction?

[StarpTech]

@joaoeudes7 Look at my last comment it was my fault.

[superhawk610]

To further clarify for anyone else that stumbles on this thread, here's the situation that causes this:

 └─ __tests__
   ├─ foo.test.js      // <- you want to run these
   └─ bar.test.js      // <-
 └─ __snapshots__
   ├─ foo.test.js.snap
   └─ bar.test.js.snap
dist
 └─ __tests__
   ├─ foo.test.js      // <- CI is also running these
   └─ bar.test.js      // <- (though they have no snapshots)

To debug this, double-check your jest.config.js and make sure you've correctly configured the testPathIgnorePatterns to include /dist/ or something similar.

Hope this helps!