Unit testing and System Testing in software testing

Unit Testing:-

•       Testing of Individual Unit (E.g. : Function, Program, Module)

1.       Also referred to as White Box Testing

2.       Typically performed by the Developer

3.       Goal of Unit testing is to uncover defects using formal techniques like:

•       Resource-behavior (e.g. memory leaks), performance or robustness testing, as well as structural testing

•       Defects and deviations in Date formats

•       Special requirements in input conditions (for example Text box where only numeric or alphabets should be entered)

•       Selection based on Combo Box’s, List Box’s, Option buttons, Check Box’s

•       Testing occurs with access to the code being tested, with the support of the development environment, such as a unit test framework or debugging tool.

4.       The testing must ensure:

•       Statement Coverage

•       Branch Coverage

Integration testing in software testing

Integration Testing

•       Testing the Integration of multiple units / modules

–      The objective is to test the application that is built by integrating the unit tested components

–      This tests interfaces between components, interactions with different parts of a system such as O.S, hardware and interfaces between systems.

–      Testers should concentrate solely on integration itself and not functionality of the individual modules to be integrated.

•       Performed by the Developer / Tester

•       Various approaches to Integration Testing could be :