Lightning can occur between opposite charges within the thunderstorm cloud (intra-cloud lightning) or between opposite charges in the cloud and on the ground (cloud-to-ground lightning). Lightning is one of the oldest observed natural phenomena on earth.
SYSTEM TESTING Fundamentals. DEFINITION. System Testing is a level of the software testing where a complete and integrated software is tested. The purpose of this test is to evaluate the systemâs compliance with the specified requirements. Definition by ISTQB. 1  system testing: The process of testing an integrated system to verify that it meets specified.
â Unit testing â focuses on testing each unit of the code. â Integration testing â focuses on testing the integration of âunits of codeâ or components. Each level of testing builds on the previous level. âSystem Testingâ is the next level of testing. It focuses on testing the system as a whole.