Mobile app development teams use various types of testing, including unit testing, integration testing, and user interface testing. To track changes in mobile apps, teams should document and monitor test results with test reports. Test reports summarize all test activities and final test results, helping stakeholders evaluate the quality of a tested product and determine whether it's ready for release. On Bitrise, teams can generate HTML test reports using a Test Report add-on that exports test results in .xcresult or JUnit XML format. To do this, developers can use jest and jest-html-reporter with a React Native application, adding a Script Step to copy the HTML report to the Deploy to Bitrise.io Step. The final workflow should display the HTML report in the Artifacts tab, allowing stakeholders to view test results and make informed decisions about product release.