We have followed below steps.
1. First need to review the requirements then need to prepare the test cases for new object/module
2. Need to review the test cases by TL if sign off then can go for execution
3. After completing the Routine testing need to do the integration testing ( of course supposed to do by dev team but we r also involved into this)
4. Need to do the system testing E2E testing by TL
5. If found any issues then same story repoting retesting and regression testing
Srinivas