Setup User Interface Automation Testing with Xamarin.UI Test

Xamarin.UITest is a testing framework that enables Automated UI Acceptance Tests written in NUnit to be run against iOS and Android applications. It integrates tightly with Xamarin.iOS and Xamarin.Android projects using Xamarin.Forms. Xamarin.UITest is the Automation Library that allows the NUnit tests to execute on Android and iOS devices. The tests interact with the user interface just as a user would, enter text, tapping buttons, and performing gestures – such as swipes.
Typically, each UITest is written as a method that is referred to as a test. The class which contains the test is known as a test fixture. The test fixture contains either a single test or logical grouping of tests and is responsible for any setup to make the test run and any cleanup that needs to be peformed when the test finishes. Each test should follow the Arrange-Act-Assert pattern:
Arrange – The test will setup conditions and initialize things so that the test can be actioned.
Act – The test will interact with the application, enter text, pushing buttons, and so on.
Assert – The test examines the results of the actions performed in the Act step to determine correctness. For example, the application may verify that a particular error message is displayed.
We will also discuss how to use the REPL included with Xamarin.UITest to explore the views on a screen and to automate interactions with the application.
Xamarin.UITest requires NUnit 2.6.3 or higher. Xamarin.UITest is not compatible with NUnit 3.0.
Only Android and iOS applications are supported. It is not possible to test Windows Phone applications.
It is possible to test Android applications with Visual Studio on Windows or Xamarin Studio on Mac OS X. To run an Android test it is necessary to have a .APK file. It is also necessary to have the JDK and the Android SDK installed. In most cases these will be automatically installed by the Xamarin.Android installer.

Working With the REPL

One of the important tools in creating UITests is the the REPL (read-eval-print-loop). The REPL is a console-like environment in which the developer enters expressions or a commands. It will then evaluate those expressions, and display the results to the user.
The REPL is helpful when creating UITests – it allows us to explore the user interface and create the queries and statements so that the test may interact with the application.
Starting the REPL
The REPL can only be started by running a test which calls the IApp.Repl() method:

public class Tests
    AndroidApp app;

    public void BeforeEachTest()
        app = ConfigureApp.Android.StartApp();

    public void CreditCardNumber_TooShort_DisplayErrorMessage()

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