Catch exceptions raised in parallelize_setup and ensure tests fail when they occur

[aricwalker]

Summary

The changes here ensure that we catch any StandardExceptions that occur during the after_fork call (blocks passed into parallelize_setup) and record those exceptions with the test results. This is work towards resolving #35835.

This results in marking all of the tests as failed to bring attention to the issue & ensure it is addressed before proceeding.

/cc #35835
/cc @eileencodes

[aricwalker]

In testing this against the example app noted in #35835, the results are exiting properly now (with 1):

# Running:

E

Error:
TestClass#test_something:
RuntimeError: Expected to fail `rails test`
    test/models/model_test.rb:3:in `block in <class:TestClass>'

Failure:
TestClass#test_something:
Expected false to be truthy.


rails test test/models/model_test.rb:6



Finished in 0.091489s, 10.9303 runs/s, 10.9303 assertions/s.
1 runs, 1 assertions, 0 failures, 1 errors, 0 skips

$ echo $?
1

Instead of with 0:

Finished in 0.222651s, 0.0000 runs/s, 0.0000 assertions/s.
0 runs, 0 assertions, 0 failures, 0 errors, 0 skip

$ echo $?
0

[kaspth]

One nit from me, but otherwise good. I’ll let Eileen take it from here.

[kaspth]

Don’t think we need present? here.

[aricwalker]

Good call, I don't believe we do. Removed in ccc2ed63c7

[kaspth]

Cool, then your commits just need to be squashed. There’s no need for a changelog entry since parallel testing isn’t out yet.

[aricwalker]

Just squashed the commits.

There’s no need for a changelog entry since parallel testing isn’t out yet.

👍