# case

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

Register one test case.

```ds title="case"
export function registerCase(name: string, argument?: CaseArgument | undefined, body?: Body | undefined): void
```

[language/library/src/test/case.ds:27:29](https://github.com/destack-sh/destack/blob/main/language/library/src/test/case.ds#L27-L29)