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Add bunfig.toml support for test randomize, seed, and rerunEach options (#23286)

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Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Alistair Smith <hi@alistair.sh>
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robobun
2025-10-06 19:48:16 -07:00
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@@ -249,6 +249,46 @@ This is useful for:
The `--concurrent` CLI flag will override this setting when specified.
### `test.randomize`
Run tests in random order. Default `false`.
```toml
[test]
randomize = true
```
This helps catch bugs related to test interdependencies by running tests in a different order each time. When combined with `seed`, the random order becomes reproducible.
The `--randomize` CLI flag will override this setting when specified.
### `test.seed`
Set the random seed for test randomization. This option requires `randomize` to be `true`.
```toml
[test]
randomize = true
seed = 2444615283
```
Using a seed makes the randomized test order reproducible across runs, which is useful for debugging flaky tests. When you encounter a test failure with randomization enabled, you can use the same seed to reproduce the exact test order.
The `--seed` CLI flag will override this setting when specified.
### `test.rerunEach`
Re-run each test file a specified number of times. Default `0` (run once).
```toml
[test]
rerunEach = 3
```
This is useful for catching flaky tests or non-deterministic behavior. Each test file will be executed the specified number of times.
The `--rerun-each` CLI flag will override this setting when specified.
## Package manager
Package management is a complex issue; to support a range of use cases, the behavior of `bun install` can be configured under the `[install]` section.