Automating mobile application testing through continuous integration (CI) tools can streamline the process, making it more efficient and consistent. Creating a testing-ready mobile app is supported by Android Studio for Android and Xcode for iOS, both of which facilitate the integration of unit tests. Different testing types, such as unit, integration, functional, UI, and performance tests, are crucial for ensuring the app's functionality and performance. CI tools, like CircleCI, can automate the building and testing processes, with configurations defined in a config.yml file, allowing developers to run tests on device simulators or physical devices. Integrating Fastlane with CircleCI further simplifies the build, test, and deployment processes for both iOS and Android applications. CI not only aids in testing but also addresses security concerns by managing credentials and authentication, ensuring data encryption, and checking for feature regression and error handling. Once testing is complete, CI can facilitate the deployment of apps to app stores, with Git branches managing the release workflow. This approach, starting with a focus on testing and CI from the beginning, is recommended for streamlined mobile app development.