---
name: Update snapshots in `bun test`
---
Bun's test runner supports Jest-style snapshot testing via `.toMatchSnapshot()`.
{% callout %}
The `.toMatchInlineSnapshot()` method is not yet supported.
{% /callout %}
```ts#snap.test.ts
import { test, expect } from "bun:test";
test("snapshot", () => {
expect({ foo: "bar" }).toMatchSnapshot();
});
```
---
The first time this test is executed, Bun will write a snapshot file to disk in a directory called `__snapshots__` that lives alongside the test file.
```txt
test
├── __snapshots__
│ └── snap.test.ts.snap
└── snap.test.ts
```
---
To regenerate snapshots, use the `--update-snapshots` flag.
```sh
$ bun test --update-snapshots
bun test v1.x (9c68abdb)
test/snap.test.ts:
✓ snapshot [0.86ms]
1 pass
0 fail
snapshots: +1 added # the snapshot was regenerated
1 expect() calls
Ran 1 tests across 1 files. [102.00ms]
```
---
See [Docs > Test Runner > Snapshots](/docs/test/mocks) for complete documentation on mocking with the Bun test runner.
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Frédéric Guillot
dzaikos