Test Levels of software testing

Unit Testing:

Unit Testing is a testing in which the individual unit of the software are tested in isolation from other parts of a program.

1. Unit Testing is primarily carried out by the developers themselves.
2. Deals functional correctness and the completeness of individual program units.
3. White box testing methods are employed.

Integration Testing:

Integration tests are performed when new code is added to an existing code base; for example, when a new function is added to a set of existing functions. Integration tests measure whether the new code works -- integrates -- with the existing code; these tests look for data input and output, correct handling of variables, etc.Deals with testing when several program units are integrated.

System Testing

Testing conducted on a complete, integrated system’s compliance with its specific requirements.

Deals with testing the whole program system for its intended purpose.

Acceptance Testing

The Testing conducted by client to evaluate the system compliance as per the business requirements.

UAT ensures that the project satisfies the customer requirements.

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