Editing White-box testing (section)

== Levels ==
#[[Unit testing]]. White-box testing is done during unit testing to ensure that the code is working as intended, before integration happens with previously tested code. White-box testing during unit testing potentially catches many defects early on and aids in addressing defects that happen later on after the code is integrated with the rest of the application and therefore reduces the impacts of errors later in development.<ref name=level />
#[[Integration testing]]. White-box testing at this level is written to test the interactions of interfaces with each other. The unit level testing made sure that each code was tested and working accordingly in an isolated environment and integration examines the correctness of the behaviour in an open environment through the use of white-box testing for any interactions of interfaces that are known to the programmer.<ref name=level />
#[[Regression testing]].  White-box testing during regression testing is the use of recycled white-box test cases at the unit and integration testing levels.<ref name=level />