Apache Cordova revolutionized mobile app development by allowing developers to create applications with a single codebase using HTML, CSS, and JavaScript, breaking the previous reliance on platform-specific languages like Objective-C and Java. However, some developers contended that Cordova's apps were not truly "native" due to their reliance on the Webview rendering engine. React Native addresses this by enabling developers to build authentic native apps using JavaScript components that map directly to the platform's native UI elements. This tutorial guides users through creating a simple React Native app, writing and running tests using the React Native testing library, and setting up a continuous integration pipeline with CircleCI to automate the testing process. The tutorial emphasizes the importance of thorough testing in mobile app development to avoid frequent updates that could frustrate users.