# androidx.test.espresso # androidx.test.espresso *** ** * ** *** Kotlin\|[Java](https://developer.android.com/reference/androidx/test/espresso/package-summary "View this page in Java") ## Interfaces |------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [EspressoException](https://developer.android.com/reference/kotlin/androidx/test/espresso/EspressoException) | Used for identifying an exception as coming from the[Espresso](https://developer.android.com/reference/kotlin/androidx/test/espresso/Espresso)framework. | | [FailureHandler](https://developer.android.com/reference/kotlin/androidx/test/espresso/FailureHandler) | Handles failures that happen during test execution. | | [IdlingResource](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResource) | Represents a resource of an application under test which can cause asynchronous background work to happen during test execution (e.g. an intent service that processes a button click). | | [IdlingResource.ResourceCallback](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResource.ResourceCallback) | Registered by an[IdlingResource](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResource)to notify Espresso of a transition to idle. | | [RootViewException](https://developer.android.com/reference/kotlin/androidx/test/espresso/RootViewException) | An[EspressoException](https://developer.android.com/reference/kotlin/androidx/test/espresso/EspressoException)that can provide a Root View. | | [UiController](https://developer.android.com/reference/kotlin/androidx/test/espresso/UiController) | Provides base-level UI operations (such as injection of[MotionEvent](https://developer.android.com/reference/android/view/MotionEvent.html)s) that can be used to build user actions such as clicks, scrolls, swipes, etc. | | [ViewAction](https://developer.android.com/reference/kotlin/androidx/test/espresso/ViewAction) | Responsible for performing an interaction on the given View element. | | [ViewAssertion](https://developer.android.com/reference/kotlin/androidx/test/espresso/ViewAssertion) | Responsible for performing assertions on a View element. | | [ViewFinder](https://developer.android.com/reference/kotlin/androidx/test/espresso/ViewFinder) | Uses matchers to locate particular views within the view hierarchy. | ## Classes |------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [AmbiguousViewMatcherException.Builder](https://developer.android.com/reference/kotlin/androidx/test/espresso/AmbiguousViewMatcherException.Builder) | Builder for[AmbiguousViewMatcherException](https://developer.android.com/reference/kotlin/androidx/test/espresso/AmbiguousViewMatcherException). | | [DataInteraction](https://developer.android.com/reference/kotlin/androidx/test/espresso/DataInteraction) | An interface to interact with data displayed in AdapterViews. | | [DataInteraction.DisplayDataMatcher](https://developer.android.com/reference/kotlin/androidx/test/espresso/DataInteraction.DisplayDataMatcher) | Internal matcher that is required for[onData](https://developer.android.com/reference/kotlin/androidx/test/espresso/Espresso#onData(org.hamcrest.Matcher)). | | [Espresso](https://developer.android.com/reference/kotlin/androidx/test/espresso/Espresso) | Entry point to the Espresso framework. | | [GraphHolder](https://developer.android.com/reference/kotlin/androidx/test/espresso/GraphHolder) | Holds Espresso's object graph. | | [IdlingPolicies](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingPolicies) | Allows users fine grain control over idling policies. | | [IdlingPolicy](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingPolicy) | Allows users to control idling idleTimeouts in Espresso. | | [IdlingRegistry](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingRegistry) | Handles registering and unregistering of[IdlingResource](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResource)s with Espresso from within your application code. | | [NoMatchingViewException.Builder](https://developer.android.com/reference/kotlin/androidx/test/espresso/NoMatchingViewException.Builder) | Builder for[NoMatchingViewException](https://developer.android.com/reference/kotlin/androidx/test/espresso/NoMatchingViewException). | | [PerformException.Builder](https://developer.android.com/reference/kotlin/androidx/test/espresso/PerformException.Builder) | Builder for[PerformException](https://developer.android.com/reference/kotlin/androidx/test/espresso/PerformException). | | [Root](https://developer.android.com/reference/kotlin/androidx/test/espresso/Root) | Represents a root view in the application and optionally the layout params of the window holding it. | | [Root.Builder](https://developer.android.com/reference/kotlin/androidx/test/espresso/Root.Builder) | | | [ViewInteraction](https://developer.android.com/reference/kotlin/androidx/test/espresso/ViewInteraction) | Provides the primary interface for test authors to perform actions or asserts on views. | ## Exceptions |----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [AmbiguousViewMatcherException](https://developer.android.com/reference/kotlin/androidx/test/espresso/AmbiguousViewMatcherException) | An exception which indicates that a`Matcher`matched multiple views in the hierarchy when only one view was expected. | | [AppNotIdleException](https://developer.android.com/reference/kotlin/androidx/test/espresso/AppNotIdleException) | An exception which indicates that the App has not become idle even after the specified duration. | | [IdlingResourceTimeoutException](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResourceTimeoutException) | Indicates that an[IdlingResource](https://developer.android.com/reference/kotlin/androidx/test/espresso/IdlingResource), which has been registered with the framework, has not idled within the allowed time. | | [InjectEventSecurityException](https://developer.android.com/reference/kotlin/androidx/test/espresso/InjectEventSecurityException) | An checked[Exception](https://developer.android.com/reference/java/lang/Exception.html)indicating that event injection failed with a[SecurityException](https://developer.android.com/reference/java/lang/SecurityException.html). | | [NoActivityResumedException](https://developer.android.com/reference/kotlin/androidx/test/espresso/NoActivityResumedException) | An exception which indicates that there are no activities in stage RESUMED. | | [NoMatchingRootException](https://developer.android.com/reference/kotlin/androidx/test/espresso/NoMatchingRootException) | Indicates that a given matcher did not match any[Root](https://developer.android.com/reference/kotlin/androidx/test/espresso/Root)s (windows) from those that are currently available. | | [NoMatchingViewException](https://developer.android.com/reference/kotlin/androidx/test/espresso/NoMatchingViewException) | Indicates that a given matcher did not match any elements in the view hierarchy. | | [PerformException](https://developer.android.com/reference/kotlin/androidx/test/espresso/PerformException) | Indicates that an exception occurred while performing a ViewAction on the UI thread. |