I don't have source code of application, I just downloaded an application from play store.
Is there any way to do load testing of users.
My scenario is 100,000 users using the App simultaneously.
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If your goal is to load test the backend of the mobile application you need to simulate the application's network traffic, to wit:
If the application uses HTTP protocol for communicating with the backend you can even record its network activity using HTTP(S) Test Script Recorder, you will need to configure your device to use JMeter as the proxy