Function test
A functional test is the term used to describe the testing of a functional unit against its functional requirements . Appropriate times for functional tests are:
- Final inspection after the functional unit has been manufactured (end of line test)
- After installation / integration in the system for which the functional unit is intended ( integration test , acceptance test (software technology) )
- Regular routine tests for the timely detection of failures of vital functions
- Immediately before planned special loads on the functional unit
- Before the planned (first) commissioning of rarely or once-only functional units of vital importance
Not only is their nominal behavior tested in a positive sense, but often a retest made - so it will be checked that personnel or equipment in dangerous or unacceptable for other reasons reactions demonstrably not occur. The cross-checks or the events that are not allowed to occur are part of the functional requirement.
However, parts of the required functionality can also be tested in the preceding test levels. Electrical components are tested in the open state in an ICT test system or as finished components.