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

•       Condition Coverage

•       Exceptional Conditions Coverage

5.       Tools that can be used:

•       Junit, JTest Case, Cactus, Jindent, Rational Quantifier, Rational Purifier

System Testing:-

•       Also referred to as a special Black Box Testing

•       It is a series of different end to end tests that fully exercise the application

•       Each test verifies that system elements have been properly integrated and perform allocated functions

•       Performed by the Tester

•       Test Environment (S / W, H / W, Data) must be as close as possible to production

•       Test Environment must be different from Development Environment

•       Test scenarios covers:

–      Functional Requirements

–      Non-functional Requirements (Performance, Recovery, Usability) – Optional

–      Automated Tools that can be used

–      Functional Test Automation – Mercury Win Runner, Rational Robot, Test Partner, QTP

–      Performance Testing – Mercury Load Runner, Rational Performance tester, VSTS, Open STA (open source)

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