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.
Integration testing is a logical extension of unit testing. In its simplest form, two units that have already been tested are combined into a component and the interface between them is tested.A component, in this sense, refers to an integrated aggregate of more than one unit. The top-down approach to integration testing requires the highest-level modules be test and integrated first. 2  This allows high-level logic and data flow to be tested early in the process and it tends to minimize the need for drivers.