Unit Testing
The main objective of Unit testing is to test each and every function.Generally unit test is done by developer.It is conducted before integration testing.
The application is divided into different modules as units and testing is performed on each single module.
Integration Testing
Testing of combined parts of an application to determine,if they function together correctly.
Integration testing is the testing of combined parts of an application to determine if they function together correctly.
System Testing
Testing that attempts to discover defects that are properties of entire system.
System testing is Black-box type of testing that is based on overall requirements specifications. It covers all combined parts of the system.
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