# testOnly

`import { testOnly } from "destack:test";`

Register one focused test.

```ds title="testOnly"
export function testOnly(name: string, body?: Body | undefined): void
```

[language/library/src/test/case.ds:57:59](https://github.com/destack-sh/destack/blob/main/language/library/src/test/case.ds#L57-L59)