Your question is Test Strategy for Messenger App. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Define a test strategy for launching a messenger app, including testing notifications and writing a unit test for save_file().
Asked in the round 4 stage. Treat this as a practical execution exercise. Explain how you would prioritize coverage, coordinate testing across the launch, validate notification behavior under failure conditions, and demonstrate the unit-test approach for save_file(). State any assumptions about the function signature or storage interface before writing the test.