Espresso framework extensively uses the Hamcrest library and extend it whenever necessary to provide simple and extendable matchers. The sample code is as follows. hasLinks() has no arguments and it returns a matcher, which matches the view having links. The sample code is as follows. Add testIDs in React Native. The sample code is as follows. It returns a matcher, which matches the view using the hint of the view. Run the test methods on the devices. withParent() accepts one argument of type Matcher. It returns a matcher, which matches the TextView based on its color. isEnabled() has no argument. See the progress of the test set on the console. Espresso framework provides many view matchers. It returns a matcher, which matches the root view. In the Select Deployment Target window, choose the device on which you want to record the test. (We do still need the first wait because synchronization is not in effect until the app itself is fully loaded and instrumented by Espresso, and Appium doesn’t know exactly when that happens). Espresso is an Android test automation library maintained by Google. Espresso is an Android test automation library maintained by Google. The argument refers a view. We can also pass the resource id of the tag name instead of the tag name itself. Espresso is collection of testing APIs, specifically designed for instrumentation/UI testing. Google released the Espresso framework in Oct. 2013. instanceOf − used to test whether the actual input is the instance of expected class. From this perspective, there’s nothing odd about creating an Appium Espresso driver. It applies to TextView only. In the Android project, create an EspressoViewFinder file: The most important function here is waitForDisplayed, which waits for a view to become visible to the user before doing a callback. androidTest for an instrumented test click OK. The answer is to eliminate the occurrence of ANR dialog or unexpected behavior in application logic. hasDescendant() accepts one argument of type Matcher. It returns a matcher, which matches the view that passed-in view is child view. It returns a matcher, which matches the the spinner based on it’s selected item’s toString value. The default animations can cause issues during the Espresso testing process, so it is recommended to turn-off the animation on the device and emulator before testing. lessThan − used to test whether the actual input is less than the expected number. 4. Wait for RN views to become visible in the tests. We only need 1 explicit wait instead of 3. The sample code is as follows. Espresso Extensions. Most people assume Espresso is an alternative to Appium; you’d pick either Appium or Espresso… withTagKey() accepts an argument of type string and the argument refers the view’s tag key. Unit Testing : Unit tests run on the local machine, i.e. It returns a matcher, which matches the view that are currently displayed completely on the screen. Add testIDs in React Native Application Not Responding dialog is the least expected event that can occur when the main thread (aka UI thread) is blocked for too long. hasBackground() accepts a single argument of type int and the argument refers the resource id of the background resource. It returns a matcher, which matches the view using the text value of the view. notNullValue − used to test whether the actual input is not null. It returns a matcher, which matches the view using supported input method of the view. The sample code is as follows. : As said before, this will result in an Android view with ContentDescription="myAwesomeListViewId" on debug builds, this id can be used to get hold of the views using Espresso. It returns a matcher, which matches the view that passed-in view is one of its sibling view. closeTo − used to test whether the actual input is close to the expected number. withId() accepts an argument of type int and the argument refers the id of the view. Home » androidx.test.espresso » espresso-contrib » 3.1.0-alpha3 AndroidX Test Library » 3.1.0-alpha3 The AndroidX Test Library provides an extensive framework for testing Android apps We needed them in the UiAutomator2 example because any time we try to find an element after a view transition, we have no guarantees about the timing of when the new view will show up, and we have to hedge our bets with an explicit wait. Some of these also apply to Appium. Finally, our test flow itself is 5 steps long, utilizing pre-defined locator fields like password. greaterThanOrEqualTo − used to test whether the actual input is greater than or equal to the expected number. It returns a matcher, which matches the view using its tag key. Add a testUtils.js file to the RN project, to inject ContentDescriptions. Rendering RN views is done async; RN uses a Javascript thread and bridge. Here are the steps to get it done nonetheless. This means the same kind of Appium script you’re used to writing, but running on Google’s top-tier automation technology. isRoot() has no argument. The sample code is as follows. Here, EditorInfo.IME_ACTION_GO is on of the input methods options. At the time of writing the latest release is 1.1.0-alpha07. containsString − used to test whether the actual input contains specified string. The sample code is as follows. The Note : Generating your test class in the same package of the original class which is being tested, will give you access to everything inside that class and package without making them public. hasMinimumChildCount() accepts one argument of type int. sameInstance − used to test whether the actual input and expected are of same instance. withText() accepts an argument of type string and the argument refers the value of the view’s text property. The sample code is as follows. ViewActions: Allows to perform actions on the view ViewAssertions: Allows to assert state of the view. Some instances that may cause this are: Other reasons are Exceptions, infinite recursive method calls, missing class definitions, deadlocks ,or implementation of unsupported features on older versions like vector drawable etc. Espresso is a testing framework for Android to make it easy to write reliable user interface tests. In this chapter, let us learn the different matchers provided by espresso testing framework as well as learn the Hamcrest library upon which the espresso matchers are built. allOf returns a matcher, which matches all the passed in matchers and here, it is used to match a view as well as check whether the view has links in its text value. Hamcrest provides a simple function assertThat and a collection of matchers to assert any objects. The sample code is as follows. It returns a matcher, which matches the view that is currently focused. It has a number of advantages, for example built-in view synchronization that ensures element finding happens during idle periods in your app. The steps includes: (1) get to the login prompt, (2) enter the username, (3) enter the password, (4) tap the log in button, and (5) verify that an element with the correct logged-in text is present. Now let’s take a look at the same test, but written for the Espresso driver: Can you spot the differences? So far, so good! startsWith − used to test whether actual the input ends with specified string. ViewMatcher : used to locate the view in the UI hierarchy(tree structure of xml layout components) using withId(R.id.id_of_view), withText("find by text on view"). hasMultilineText() has no argument. Install the application and test files onto the selected devices. hasFocus() has no argument. This applies to EditText only. 2. Why Espresso? Post was not sent - check your email addresses! The React Native library for Android is currently not well setup for Espresso testing. isDescendantOfA() accepts one argument of type Matcher. The sample code is as follows. Let us write a simple example to test whether a list object has expected value. not − accept one matcher and matches only if the matcher failed and vice versa. I hope that testing will now help you to be a stellar programmer, you can share your love by giving this guide a thumbs up. The argument refers the child count of a view. hasContentDescription() has no argument. RecyclerViewActions. The sample code is as follows. The sample code is as follows.

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