There are several full application frameworks out there, but we will show you how to use Appium (http://appium.io). Appium is an awesome open source application testing framework. Appium supports both iOS and Android, which makes it a perfect fit for doing all our on-device testing. You want to start creating tests to test your basic flow through your application, and even create more complicated tests that test alternate flows through your app.
Let's get it installed first; run the following command:
npm install appium wd nativescript-dev-appium --save-dev
The preceding command installs Appium, the Appium communication driver WD (http://admc.io/wd/), and the NativeScript driver (https://github.com/NativeScript/nativescript-dev-appium ...