[Bug]: Custom snapshot serializer not used when reporting error diffs

[danfuzz]

Version

29.7.0

Steps to reproduce

1. Unpack this tarball: 2024-danfuzz-jest-demo.tar.gz
2. npm install
3. npm test

Expected behavior

I expect to see the custom serializer used when displaying the diffs between the expected and received values in the second test case (test('fails, thereby demonstrating the problem', ...)). In this case it should probably look like this:

    - Expected  - 2
    + Received  + 2

      new SomeClass(
    -   "zorch",
    -   "florp")
    +   "foo",
    +   "bar")

Actual behavior

The custom serializer is ignored. The salient part of the reported error looks like this, which is unfortunately not very helpful:

    Expected: {}
    Received: serializes to the same string

Additional context

I tried adding the custom serializer both via the config file (snapshotSerializers) and using expect.addSnapshotSerializer() in the test file. Neither seems to work.

The first test in example.test.js is there to demonstrate that the serializer is indeed hooked up.

In case it's useful, here's the example tarball in base64-encoded form:

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Environment

System:
    OS: macOS 14.7.1
    CPU: (8) arm64 Apple M1
  Binaries:
    Node: 23.2.0 - /opt/homebrew/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 10.9.0 - /opt/homebrew/bin/npm
  npmPackages:
    jest: ^29.7.0 => 29.7.0

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[cpojer]

Please send a PR.

[danfuzz]

@cpojer I'm glad to find out a PR would even be considered by the project.

I'd like to request that the issue get formally triaged by someone with that authority.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing. @cpojer suggested I write a PR, which I might be able to do (I've looked at the code enough to have at least some sense of how it works), but I'm definitely not going to give it a go until/unless this issue actually gets triaged.

Thanks for your collective consideration, and thanks to the folks who work on the project for all you've done.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[danfuzz]

Hi! Commenting to keep this open. I believe it's worth addressing.

[github-actions[bot]]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions[bot]]

This issue was closed because it has been stalled for 30 days with no activity. Please open a new issue if the issue is still relevant, linking to this one.

[github-actions[bot]]

This issue was closed because it has been stalled for 30 days with no activity. Please open a new issue if the issue is still relevant, linking to this one.

[github-actions[bot]]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs. Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.