Difference between Unit Testing and System Testing

System Testing:
System testing is done to check whether the software or product meets the specified requirements or not. It is done by both testers and developers. It contains the System testing and Integration testing. It is done through more positive and negative test cases. 

Unit Testing:
Unit Testing is the type of software testing level in which each individual component of the software is tested. Unit Testing is generally performed by the developer. Unit Testing can’t be used for those systems which have a lot of interdependence between different modules. It does not allow for parallel testing. 

Difference Between Unit Testing and System Testing:

S. No.	Unit Testing	System Testing
1.	In unit testing, independent software module are tested separately.	System testing is done to check whether the software or product meets the specified requirements or not.
2.	Unit testing is performed by the developers.	System testing is generally done by developers and testers.
3.	Unit testing is also called white box testing.	System testing is also called black box testing.
4.	Unit testing generally focuses on functional verification.	System testing generally focuses on system validation.
5.	Unit testing comprise of independent modules.	System Testing comprise of System and integration testing.
6.	Unit testing follows the specification of modules.	System testing follows the requirements specification.
7.	It gives high performance because of single module testing at a time.	It gives relatively low performance than unit testing.
8.	Error finding is easy.	Error finding is difficult as compared to unit testing.
9.	Resource requirement is less.	It needs more resources.
10.	Maintenance is relatively less expensive.	Maintenance is expensive.
11.	It is cost effective as there is requirement of less number of resources.	It is expensive.
12.	Code details are visible in this type of testing.	Code details are not visible in this type of testing.
13.	Some of the frameworks used for unit testing are as follows: NUnit (For C#) JUnit (For Java) Embunit (For C or C++) HtmlUnit (For JavaScript) and more.	Some of the frameworks used for system testing are as follows: Froglogic Squish Robotium Smart Bear’s Soap UI and more.

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