The Free On-line Dictionary of Computing (30 December 2018):

system testing
application testing

    (Or "application testing") A type of testing to
   confirm that all code modules work as specified, and that the
   system as a whole performs adequately on the platform on
   which it will be deployed.

   System testing should be performed by testers who are trained
   to plan, execute, and report on application and system code.
   They should be aware of scenarios that might not occur to the
   end user, like testing for null, negative, and format
   inconsistent values.  A tester should be able to repeat the
   steps that caused an error.

   (2003-09-24)