---
title: "registerIdlingResource"
description: "Attempts to register an IdlingResource in this test."
type: "function"
lastmod: "2026-05-20T01:13:53.104360Z"
---
## API Reference

### registerIdlingResource

> Source set: Common

```kotlin
@ExperimentalTestApi
fun ComposeUiTest.registerIdlingResource(idlingResource: IdlingResource): Boolean
```

Attempts to register an [IdlingResource](/jetpack-compose/androidx.compose.ui/ui-test/interfaces/IdlingResource) in this test.

This implementation checks [isIdlingResourceSupported](/jetpack-compose/androidx.compose.ui/ui-test/functions/isIdlingResourceSupported) before attempting to register the
resource.

#### Returns

| | |
| --- | --- |
|  | true if the idling resource was successfully registered, or false if the implementation does not support idling resources. |