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



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.



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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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SevenMentor Pvt. Ltd. – Software Testing Training Institute in Pune

Address: Shivaji Nagar, Pune, Maharashtra – 411005

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Website: www.sevenmentor.com

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Concluding Software testing is the study of processes, quality improvement, and customer satisfaction-not just tools. Mastering Manual and

Automation Testing will offer you a strong basis for a future-proof career in modern QA practices.

At SevenMentor, we ensure every student gets the right guidance and mentorship to enjoy

placement support to become a successful Software Tester in today’s competitive IT landscape.