What are the different levels of software testing?

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Software testing is typically organized into several levels, each aimed at validating specific aspects of the software. The main levels are:

  1. Unit Testing: This is the lowest level of testing, focusing on individual components or functions. Developers write and run these tests to ensure each unit of the code behaves as expected.

  2. Integration Testing: After unit testing, individual components are combined and tested as a group. The goal is to verify that modules interact correctly, and data flows properly between them. It can be done in different ways, such as top-down, bottom-up, or big bang.

  3. System Testing: This level validates the complete and integrated software application. Testers assess the system’s compliance with the specified requirements. It includes functional and non-functional testing (e.g., performance, usability, and security).

  4. Acceptance Testing: The final level, often conducted by the end-users or clients, ensures the software meets business needs and is ready for deployment. Common forms include User Acceptance Testing (UAT), Alpha Testing, and Beta Testing.

Each level serves a distinct purpose in identifying defects early, improving quality, and reducing risk. Together, they provide a comprehensive evaluation of the software’s functionality, performance, and reliability.

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