Below is an example of a Test Scenario for testing the Telegram mobile application. Determine what type of testing it belongs to:

Test Scenario: Simulate an incoming call while the user is actively using the Telegram app. 

Test Steps: 

1. Initiate an ongoing activity within the Telegram app (e.g., sending messages or browsing). 
2. Simulate an incoming call to the device. 
3. Verify that the app pauses its ongoing activity and displays the incoming call notification. 
4. Check if the user can answer or decline the call. 
5. Verify that the app resumes normal operation after handling the call interruption.