---
lang: en
title: 'API docs: testlab.testdefinition'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/testlab
permalink: /doc/en/lb4/apidocs.testlab.testdefinition.html
---

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[Home](./index.md) &gt; [@loopback/testlab](./testlab.md) &gt; [TestDefinition](./testlab.testdefinition.md)

## TestDefinition type

A function defining a new test case or a test suite, e.g. `it` or `describe`<!-- -->.

**Signature:**

```typescript
export type TestDefinition<ARGS extends unknown[], RETVAL> = (name: string, ...args: ARGS) => RETVAL;
```