What are the 4 levels of testing?

[aarush]

The 4 levels of software testing (also referred to as levels of testing)
are the order in which testing is executed in the software development life cycle (SDLC).
Here's a concise overview

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1. Unit Testing
Purpose: To test the individual pieces or modules of the software (such as functions, methods, or classes).
Done by: Developers.
Objective: Make sure each unit is working fine and independently.
Example: Testing a login function to ensure it will take valid credentials and reject invalid ones.

2. Integration Testing
Objective: To test interactions among combined modules.
Carried out by: Developers or testers.
Objective: To identify interface or communication faults between modules.
Example: Ensuring that the login module properly interfaces with the database module.

3. System Testing
Objective: To test the integrated and complete system as an entirety.
Carried out by: QA/Test engineers.
Objective: Verify the entire software against given requirements and behaves as desired.
Example: Full application (login → dashboard → logout) testing to verify overall behavior.
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4. Acceptance Testing
Objective: To validate software from the client or end-user's point of view.
Done by: End users or clients.
Objective: Verify the product for release and is as required by business.
Example: End user verifies the software meets all business needs prior to sign-off.

In short:
Unit Testing → Integration Testing → System Testing → Acceptance Testing
Do you want a quick diagram or table illustrating these 4 steps for your notes or presentation?

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