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docs: document E2E test optimization

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mkorwel
2026-04-24 17:48:20 +00:00
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docs/ci_optimization_report.md
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@@ -121,6 +121,20 @@ We marked the entire `file-system.test.ts` suite as flaky and skipped it.
- **Timings:** The passing tests took 2-5 minutes each, making the file
extremely slow.
## E2E Test Optimization: `sendKeys` vs `type`
We found that interactive E2E tests were slow because they used `run.type()`,
which types characters one by one and waits for echo with a 5-second timeout per
character.
- **Optimization:** We replaced `run.type()` with `run.sendKeys()` in
`shell-background.test.ts`, which sends characters with a fixed 5ms delay
without waiting for echo.
- **Result:** The test duration dropped from hanging/minutes to just **8.3
seconds**!
- **Impact:** This brought down the total E2E job time significantly in the
successful run (to ~3m 16s).
## Recommended Future Work
To further improve test speed and quality: