Set up a unit testing framework: You can use NUnit, MSTest, or xUnit to set up your unit tests. If you are using Visual Studio, you can install the NUnit Test Adapter or xUnit.net Test Adapter to run your tests. Create a test project: In your Xamarin Forms solution, create a new project and select the unit testing framework you are using. Write your unit tests: In your test project, create a new test class and write your unit tests. You can test your ViewModel, Model, or any other component in your Xamarin Forms application. Run the tests: You can run your tests using the test runner in your IDE or by running the command-line interface. Make sure all tests pass before releasing your code. Refactor and repeat: As you develop your application, continue to write and run unit tests. Refactor your code as necessary to ensure that your tests pass and your application is working as intended.