ShouldMatchApproved opens multiple instances of difftool

[dennisroche]

Recently had 75+ instances of Beyond Compare open as all the tests failed.

Beyond Compare and KDiff both support opening multiple files or directory comparison.

I'm not sure how I would implement this yet... but it would be nice if diffs are opened at the end of the test run.

[dennisroche]

Two possible options.

1. AppDomain.Unload to determine when the tests have finished.
2. Limit the number of diffs opened, e.g. 5.

[SimonCropp]

@josephwoodward FWIW this is how it is handled in diffengine https://github.com/VerifyTests/DiffEngine/blob/master/docs/diff-tool.md#maxinstancestolaunch

[dennisroche]

DiffRunner.MaxInstancesToLaunch(5); helps solve the problem without having to mess about with AppDomain.Unload

Happy to close.

[dennisroche]

🤦‍♂️ that was in another project.

yes, we should copy that approach or perhaps even better integrate with DiffEngine. i'm happy to pick this up and fix.