Is there a simple way to programmatically export diff images?

[kanjanaSi]

I have a question about handling test failures. When a snapshot test fails, a diff image is generated. Is there a straightforward or built-in way to programmatically save this diff image to a specific, predictable path?

For example, I'd like to be able to automatically export the diff to a path like this upon failure:
…/MyAppTests/Snapshots/MyViewControllerTests/diff_testMyViewController.png

This would be extremely helpful for our CI/CD process, allowing us to easily archive and review the visual differences without having to manually extract them from the test logs or Xcode.

I've looked through the documentation but haven't found a direct way to configure this output path. Is there a recommended approach or a configuration option I might have missed?

Thanks for your time and any guidance you can provide!

[dr-star]

When a test fail a diff image isn't generated my the library you can use a DiffTool to generate one between the reference image and the failed image.

Try to check

swift-snapshot-testing/Sources/SnapshotTesting/SnapshotTestingConfiguration.swift

Line 156 in a8b7c5e

public struct DiffTool: Sendable, ExpressibleByStringLiteral {

As far as I know the library do not run the code for you, but you could get the output of the failed test and use within your CI/CD to save the diff image (and maybe also the reference and failed) to a separate folder. I hope this can help you