---
title: testing.assertEquals() function
description: >
  `testing.assertEquals()` tests whether two streams of tables are identical.
menu:
  flux_v0_ref:
    name: testing.assertEquals
    parent: testing
    identifier: testing/assertEquals
weight: 101
flux/v0/tags: [tests]
---

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`testing.assertEquals()` tests whether two streams of tables are identical.

If equal, the function outputs the tested data stream unchanged.
If unequal, the function returns an error.

assertEquals can be used to perform in-line tests in a query.

##### Function type signature

```js
(<-got: stream[A], name: string, want: stream[A]) => stream[A]
```

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

## Parameters

### name
({{< req >}})
Unique assertion name.



### got

Data to test. Default is piped-forward data (`<-`).



### want
({{< req >}})
Expected data to test against.




## Examples

- [Test if streams of tables are different](#test-if-streams-of-tables-are-different)
- [Test if streams of tables are different mid-script](#test-if-streams-of-tables-are-different-mid-script)

### Test if streams of tables are different

```js
import "sampledata"
import "testing"

want = sampledata.int()
got = sampledata.float() |> toInt()

testing.assertEquals(name: "test_equality", got: got, want: want)

```


### Test if streams of tables are different mid-script

```js
import "testing"

want =
    from(bucket: "backup-example-bucket")
        |> range(start: -5m)

from(bucket: "example-bucket")
    |> range(start: -5m)
    |> testing.assertEquals(want: want)

```