Parallel crash test case sometimes fails

[gaborcsardi]

Typically on R-devel Linux:

  ══ Failed tests ════════════════════════════════════════════════════════════════
  ── Failure ('test-parallel-crash.R:22:3'): crash ───────────────────────────────
  Expected `err` to inherit from "testthat_process_error".
  Actual class: "c_error"/"rlib_error_3_0"/"rlib_error"/"error"/"condition".
  ── Failure ('test-parallel-crash.R:23:3'): crash ───────────────────────────────
  Expected `err$test_file` to be equal to "test-crash-3.R".
  Differences:
  `actual` is NULL
  `expected` is a character vector ('test-crash-3.R')

https://github.com/r-lib/testthat/actions/runs/18295383735/job/52092436840

[gaborcsardi]

Potentially related: