The engine `triggerTask` suite was a single 2447-line file with 23
`containerTest` cases, each spinning its own Postgres + Redis. vitest
shards by whole file, so all 23 container setups landed on one shard and
dominated its wall-clock. The recorded entry in `test-timings.json`
badly under-counts the real cost (it does not capture the
per-`containerTest` container startup that dominates on CI), so the
duration-sharding sequencer treated the file as light and stacked it,
producing one ~21 minute shard.
Splitting does not reduce the number of container setups; it lets those
23 cases distribute across shards instead of stacking on one. The webapp
unit-test stage is gated by its slowest shard, so this cuts the stage's
wall-clock roughly in half.
## CI timing (before vs after)
Real CI wall-clock of the `Unit Tests: Webapp` shards (`--shard=i/10`).
"Before" is sampled from recent runs on other branches (unsplit file,
from `main`); "after" is this PR.
| Shard | Before (s) | After (s) |
|------:|-----------:|----------:|
| 1 | 250 | 359 |
| 2 | 444 | 411 |
| 3 | 497 | 659 |
| 4 | **1257** | 284 |
| 5 | 545 | 641 |
| 6 | 284 | 644 |
| 7 | 244 | 214 |
| 8 | 340 | 445 |
| 9 | 188 | 395 |
| 10 | 234 | 567 |
| **Slowest shard (gates the stage)** | **~1247s (≈21m)** | **659s
(≈11m)** |
| Sum of all shards | 4283 | 4619 |
Before: shard 4 is the long pole at 1237s / 1247s / 1257s across three
sampled runs (the `triggerTask` file plus whatever else the packer put
with it). After: the six pieces spread across shards, the slowest drops
to 659s. The small rise in summed time is the extra per-file container
startup, paid in parallel across shards, so the gating number still
falls by about 10 minutes.
## Change
Split into six per-concern files that share a `triggerTaskTestHelpers`
module (the `vi.mock` calls stay per-file, since vitest hoists them):
- `triggerTask.test.ts` (3): trigger + concurrencyKey coercion
- `triggerTask.idempotency.test.ts` (4): idempotency + queue resolution
- `triggerTask.debounce.test.ts` (4): retries + debounce validation
- `triggerTask.mollifier.test.ts` (4): mollifier call-site behaviour
- `triggerTask.metadataCache.test.ts` (4): DefaultQueueManager task
metadata cache
- `triggerTask.residency.test.ts` (4): child run residency inheritance
All 23 cases are preserved. The file's `test-timings.json` entry is
split across the new files so bin-packing stays balanced.
While rewriting these files, cleanup was moved to `onTestFinished(() =>
engine.quit())` so an `engine`/`Redis` leaked on a failing assertion no
longer persists on the worker-scoped Redis and cascades into later cases
(`hookTimeout` raised to 60s so the after-cleanup gets the full budget).
Prisma lookups switched from `findUnique` to `findFirst` to match the
repo convention.
Verified: all six files run green locally (23/23), oxlint and oxfmt
clean.
Daniel Sutton