What is TestFlight, and how do testers get mobile test builds?
MobileJunior
In shortTestFlight is Apple's service for installing beta builds on iPhones. On Android, testers usually get builds through Google Play testing tracks, Firebase App Distribution or a direct APK.
Model answer
Mobile apps can’t simply be “deployed to a URL” like websites, so teams use beta distribution tools.
iOS: TestFlight
- Developers upload a build to App Store Connect; testers get it through the TestFlight app.
- Internal testers (team members) get builds right away; external testers need a quick Apple beta review first.
- Builds expire after 90 days. Testers can send feedback and screenshots from inside TestFlight, and crash reports are collected.
Android
- Google Play testing tracks: internal, closed and open testing. Builds come through the normal Play Store.
- Firebase App Distribution: testers get an email or use the App Tester app; works for iOS too.
- Direct APK installed with adb, common for quick dev builds.
Good habits as a tester
- Always note the version and build number (for example 4.2.0 (318)) and the environment (dev, staging, production) in bug reports.
- After a fix, confirm the new build actually contains it before retesting.
- Keep older builds available for upgrade testing.
Learn more: TestFlight and Firebase App Distribution
What they're looking for
Familiarity with the common distribution channels, and the habit of always checking which build and environment you are testing.
Common mistakes
- Not knowing how a build gets onto a test device.
- Reporting bugs without the exact build number.
- Testing an old build because the app didn't update automatically.
More mobile questions
- How is testing a mobile app different from testing a website?Mid-level
- How do you decide which devices to test on, and when do you use emulators, simulators or real devices?Mid-level
- What are the main differences between testing on iOS and Android?Junior
- How do you test interruptions in a mobile app?Junior