---
title: testing.shouldErrorWithCode() function
description: testing.shouldErrorWithCode() calls a function that catches any error and checks that the error matches the expected value.
url: https://docs.influxdata.com/flux/v0/stdlib/internal/testing/shoulderrorwithcode/
estimated_tokens: 749
product: Flux
version: v0
---

# testing.shouldErrorWithCode() function

-   Flux 0.182.0+
-   View InfluxDB support

`testing.shouldErrorWithCode()` calls a function that catches any error and checks that the error matches the expected value.

##### Function type signature

```js
(code: uint, fn: () => A, want: regexp) => stream[{match: bool, code: uint, _diff: string}]
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### fn

(Required) Function to call.

### want

(Required) Regular expression to match the expected error.

### code

(Required) Which flux error code to expect

## Examples

### Test die function errors

```js
import "testing"

testing.shouldErrorWithCode(fn: () => die(msg: "error message"), want: /error message/, code: 3)
```

[tests](/flux/v0/tags/tests/)