Testing Levels and Types

Testing Levels and Types

There are basically three levels of testing i.e. Unit Testing, Integration Testing and System Testing. Various types of testing come under these levels.

Unit Testing

•       To justify a single program or a section of a individual program.
•     Lowest-level component test (Each test validates a single module that, based on the technical   design documents, was built to perform a certain task )
•    Key foundation for later levels of testing
•    Detects 65% - 75%  of all bugs
•    Stand-alone test (Each test examines an individual component that is new or has been       modified.
•    Ensures the conformance to each unit in LLD.(Low Level Design)
•    Also known as Module test

Integration Testing-

To verify interaction between system components

Prerequisite: unit testing completed on all components that compose a system.

•       Testing two or more modules or functions together with the intent of finding interface defects between the modules or functions.

•       On a larger level, integration testing can involve a putting together of groups of modules and functions with the goal of completing and verifying that the system meets the system requirements.

•       An incremental series of tests of combinations or sub assemblies of selected components in an overall system.

•       Integration testing is incremental in that successively larger and more complex combinations of components are tested in sequence, proceeding from the unit level to eventually the full integrated system

•       Ensures the conformance to each module in HLD (High Level Design)

System Testing:-

To verify interaction between system components

Prerequisite: unit testing completed on all components that comprise a system.

•    Testing more than two modules or functions together with the eager of finding interface defects between the modules or functions

•     On a larger level, integration testing can engage a putting together of groups of modules and functions with the goal of completing and justifying that the system meets the system requirements.

•     An incremental series of tests of combinations or sub assemblies of prefered components in an overall system.

•     Integration testing is incremental in that successively higher and more complex combinations of components are tested in sequence, proceeding from the unit level to eventually the full integrated system

•     Clinch the conformance to each module in HLD (High Level Design)

User Acceptance Testing-

•    Independent test performed by the enjoyer or QA prior to accepting the delivered system

•   Clinch the conformance to the Functional Requirements as specified in the URD

•   UAT (User acceptance testing) clinch that the project satisfies the customer requirements.

Types of UAT Testing

 1. Alpha Testing: It is the test done by the client at the developer’s spot.

 2. Beta Testing:  This is the test done by the end-users at the client’s site or at there own site.