`vitest-pool-workers` does not run tests against workflows reliably in CI

[hmnd]

What versions & operating system are you using?

System:
OS: Linux 6.16 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
Memory: 17.12 GB / 31.08 GB
Container: Yes
Shell: 5.2.15 - /bin/bash
Binaries:
Node: 22.18.0 - /usr/local/bin/node
npm: 10.9.3 - /usr/local/bin/npm
pnpm: 10.15.1 - /usr/local/bin/pnpm

Please provide a link to a minimal reproduction

No response

Describe the Bug

I'm experiencing an issue where I'm not able to run tests against workflows in CI (on Gitlab), while the same setup works perfectly fine locally on my machine. I've tried everything I can and still keep running into this issue.

Please let me know if any further details can help with figuring this out!

My vitest config looks like this:

{
  test: {
    globals: true,
    poolOptions: {
      workers: {
        main: './tests/example-workflow/index.ts',
        wrangler: {
          configPath: './wrangler.toml',
        },
        miniflare: {
          workflows: {
            TEST_WORKFLOW: {
              name: 'test-workflow',
              className: 'TestWorkflow',
            },
          },
        },
        isolatedStorage: false,
      },
    },
    testTimeout: 60_000,
  }
}

Please provide any relevant error logs

workerd/io/worker.c++:2168: info: uncaught exception; source = Uncaught (in promise); stack = Error: [vitest-worker]: Timeout calling "resolveId" with "["/builds/xxx/cf-workers/packages/xxx-xxx/tests/example-workflow/index.ts",null,"ssr"]"
    at Object.onTimeoutError (builds/xxx/cf-workers/.pnpm/vitest@3.2.4_@types+debug@4.1.12_@vitest+ui@3.2.4_jiti@2.5.1_jsdom@26.1.0_lightningcss@_3c9040e5fe907c24fdbb08fbda7e5898/node_modules/vitest/dist/chunks/rpc.-pEldfrD.js:53:10)
    at builds/xxx/cf-workers/.pnpm/vitest@3.2.4_@types+debug@4.1.12_@vitest+ui@3.2.4_jiti@2.5.1_jsdom@26.1.0_lightningcss@_3c9040e5fe907c24fdbb08fbda7e5898/node_modules/vitest/dist/chunks/index.B521nVV-.js:59:62