failed - Snapshot comparison failed: Optional(Error Domain=Foundation._GenericObjCError Code=0 "(null)")

Question

failed - Snapshot comparison failed: Optional(Error Domain=Foundation._GenericObjCError Code=0 "(null)")

brunosrocha opened this issue 5 years ago · comments

Does someone have the same issue?

No matter what I do I keep getting this failed - Snapshot comparison failed: Optional(Error Domain=Foundation._GenericObjCError Code=0 "(null)") when trying to run my snapshot tests.

I am using XCode 11.3.1

Michael Kearns · Answer 1 · Fri May 15 2020 00:40:01 GMT+0800 (China Standard Time)

We're also having this issue -- interestingly it's only affecting some of us, despite having near-identical setups.

@brunodossantosrocha1510 have you managed to find any workarounds since you posted this?

Bruno Rocha · Answer 2 · Fri May 15 2020 18:11:53 GMT+0800 (China Standard Time)

@MichaelKearnsSoftwire I have tried literally everything and also didn't have success.. Have you had any success?

Ana Borba · Answer 3 · Sat May 16 2020 01:35:19 GMT+0800 (China Standard Time)

I'm having exactly the same problem with version 11.3.1 of XCode

Michael Kearns · Answer 4 · Sat May 16 2020 19:29:01 GMT+0800 (China Standard Time)

Have you had any success?

@brunodossantosrocha1510 yes, we have in fact! It seemed to be a permissions issue.

Things you could try which might solve the problem:

Try running as a different user (either as admin or non-admin)
Delete the snapshot files, re-generate them then re-execute the tests.

In our investigation, we saw that executing against the freshly checked-out repository caused the above error, but deleting and re-generating the snapshot images enabled them to pass -- the re-generated images had the same binary content (so git did not show any differences) but inspecting the files with ls -al@ showed that the extended attributes of the file had changed, adding a new com.apple.macl attribute (more info on this here)

Afraid I don't have any more info right now -- hopefully the above helps you out, if not I'll see if I can find out more next week.

Isaac Greenspan · Answer 5 · Tue Jul 14 2020 05:06:58 GMT+0800 (China Standard Time)

I think I was seeing these errors and was able to solve them by giving SimulatorTrampoline.xpc full disk access. I'm not sure that's ideal, though.

Roman · Answer 6 · Sat Jul 25 2020 15:58:09 GMT+0800 (China Standard Time)

Same here, XCode 11.6. Tried to give full access to SimulatorTrampoline without success

watanave · Answer 7 · Thu Oct 08 2020 05:54:16 GMT+0800 (China Standard Time)

@brunodossantosrocha1510

I had the same problem. And that was resolved.

I was NOT calling the super.setUp().
hope this helps.

Davi Marcelino · Answer 8 · Thu Dec 22 2022 02:23:39 GMT+0800 (China Standard Time)

I have this problem and it was happening because the Desktop folder locked the files and the snapshot can not read them, so now I just use the root folder (~/) and everything worked.