---
title: Flux testing functions
description: >
  Flux testing functions test piped-forward data in specific ways and return errors if the tests fail.
menu:
  v2_0_ref:
    name: Testing
    parent: Flux functions
weight: 204
---

Flux testing functions test piped-forward data in specific ways and return errors if the tests fail.
To use them, import the `testing` package:

```js
import "testing"
```

{{< children type="functions" show="pages" >}}