# testPolicy

`import { testPolicy } from "destack:runtime";`

Test one policy query against one world.

```ds title="testPolicy"
export declare function testPolicy(world: WorldHandle, query: &'a readonly PolicyQuery): Result<PolicyDecision, HostError>
```

[language/library/src/runtime/policy.ds:173:176](https://github.com/destack-sh/destack/blob/main/language/library/src/runtime/policy.ds#L173-L176)