API Testing vs. Unit Testing

API testing and unit testing are not the same thing, although they are similar.

Unit Testing	API Testing
Developer perform it	Tester Perform it
Separate functionality is tested	End to End functionality is tested
Developer can access the source code	Testers cannot access the source code
UI testing is also involved	Only API functions are tested
Usually ran before check-in	Ran after build is created
Only basic functionalities are tested	All functional issues are tested