General Interview Questions on Software Testing (Part 2)

1. What is Unit Testing?
   Unit testing is the testing of individual components(units) of the Software. Unit testing is the most 'micro' scale of testing; to test particular functions or code modules. Typically done by the programmer and not by testers, as it requires detailed knowledge of the internal program design, logic and code. Not always easily done unless the application has a well-designed architecture with tight code; may require developing test driver modules or test harnesses. The test is based on coverage of code statements, paths, branches and conditions.


2. What is Integration Testing?
   It is the testing of combined parts of an application to determine if they function together correctly. The 'parts' can be code modules, individual applications, client and server applications on a network, etc. This type of testing is especially relevant to client/server and distributed systems.


3. Describe System Testing.
   The System testing is to test the System on its overall performance with the Requirements. It is a block-box type testing , which involves in checking the System for Functional requirements, Response time/Performance , Security, Load/Stress/Volume, Usability, Interoperability, etc., (Depends on Technology like eCom, Web, Client / Server, Embedded). Software once validated for meeting the functional requirements must be verified for proper interface with other system elements like hardware, database and people. It verifies that all these system elements mesh properly and the software achieves overall function/performance.
   
4. What is acceptance testing?
   Formal testing conducted to determine whether or not a system satisfies its acceptance criteria and to enable the customer to determine whether or not to accept the system. The goals of these tests are to verify actual data acceptance, processing, and retrieval, and the appropriate implementation of the business rules.


5. What is regression testing?
   Re-testing the application after bug fixes or modifications of the software or its environment.


6. How testing is different from debugging?
   Testing is more to do with establishing that defects exist in a software component or a system, Where as debugging is the action of isolating where the defect is. Thus testing and debugging are complementary activities.