Скачать или смотреть java rock espresso

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java rock espresso is a tool for writing and running automated tests for android applications. it is designed to provide a simple and consistent api for interacting with the user interface of an application and is part of the android testing support library.

getting started with espresso

to start using espresso, you'll need to set up your android project with the necessary dependencies. below is a step-by-step guide to help you get started.

#### step 1: set up your project

1. *open your android project in android studio.*
2. *add the espresso dependencies:*
in your `build.gradle` (app-level) file, add the following dependencies:



3. *sync your project* to download the necessary dependencies.

#### step 2: create a test class

1. *create a new test class:*
in the `androidtest` directory of your project, create a new java class (e.g., `mainactivitytest.java`).

2. *write your first test:*
below is a simple example to test a button click in an activity.



#### step 3: run your test

1. *run the test:*
in android studio, right-click on the test class (`mainactivitytest.java`) and select `run 'mainactivitytest'`.
this will run your espresso test on an emulator or connected device.

2. *check the results:*
once the test completes, you can see the results in the run window. if the test passes, it indicates that the button click successfully changed the text of the textview.

key concepts in espresso

*intents:* use espresso intents to test the interaction between activities.
*view matchers:* use matchers like `withid()`, `withtext()`, etc., to find ui elements.
*view actions:* use actions like `click()`, `typetext()`, etc., to perform operations on ui elements.
*view assertions:* use assertions like `matches()` to verify the state of ui elements.

tips for writing effective espresso tests

1. *keep tests simple:* each test should focus on a single functionality.
2. *use idling resources:* if yo ...

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