It also known as components, module or program testing. It is done by developers before the setup is handed over to the testing team to formally execute the test cases.

1. What is Unit Testing ?
Level of Testing :
1 . Unit Testing :
It also known as components, module or program testing. It is done by developers before the
setup is handed over to the testing team to formally execute the test cases. It is performed by the
developers on the individual units of source code assigned areas. The developers use test data
that is different from the test data of the quality assurance team. Most often stubs and drivers are
used to replace the missing software and simulate the interface between the software
components.
 This Testing done before Integration testing

2. Limitations of Unit Testing
Using this we cannot find each and every bug in an application. It is impossible to evaluate every
execution path in every application. There is a limit to the number of scenarios and test data that
a developer can use to verify a source code.
Test Basis :
 Component Requirements
 Detailed Design
 Code
Test Objective :
 Component
 Programs
 Data conversions
 Database Module