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`bun:test` supports seeing which lines of code are covered by tests. To use this feature, pass `--coverage` to the CLI:
```sh
bun test --coverage
```
It will print out a coverage report to the console:
```js
-------------|---------|---------|-------------------
File | % Funcs | % Lines | Uncovered Line #s
-------------|---------|---------|-------------------
All files | 38.89 | 42.11 |
index-0.ts | 33.33 | 36.84 | 10-15,19-24
index-1.ts | 33.33 | 36.84 | 10-15,19-24
index-10.ts | 33.33 | 36.84 | 10-15,19-24
index-2.ts | 33.33 | 36.84 | 10-15,19-24
index-3.ts | 33.33 | 36.84 | 10-15,19-24
index-4.ts | 33.33 | 36.84 | 10-15,19-24
index-5.ts | 33.33 | 36.84 | 10-15,19-24
index-6.ts | 33.33 | 36.84 | 10-15,19-24
index-7.ts | 33.33 | 36.84 | 10-15,19-24
index-8.ts | 33.33 | 36.84 | 10-15,19-24
index-9.ts | 33.33 | 36.84 | 10-15,19-24
index.ts | 100.00 | 100.00 |
-------------|---------|---------|-------------------
```
If coverage is below a threshold, `bun:test` will exit with a non-zero exit code to indicate the failure.
### Configuring coverage
`bunfig.toml` supports configuring coverage:
```toml
[test]
# Always enable coverage
coverage = true
# Anything less than 90% coverage will fail the test
# coverageThreshold = 0.9
coverageThreshold = { line = 0.9, function = 0.9 }
# Don't include .test.* files in coverage reports
coverageSkipTestFiles = true
# Disable sourcemap support in coverage reports
# By default, coverage reports will automatically use Bun's internal sourcemap.
# You probably don't want to configure this
# coverageIgnoreSourcemaps = false
```
`coverageThreshold` can be either a number or an object with `line` and `function` keys. When a number, it is treated as both the line and function threshold.
Coverage support was added in Bun v0.7.3.
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