Editing Code coverage (section)

=== Parameter value coverage ===
'''Parameter value coverage''' (PVC) requires that in a method taking parameters, all the common values for such parameters be considered. The idea is that all common possible values for a parameter are tested.<ref>{{cite web| url = http://www.rhyous.com/2012/05/08/unit-testing-with-parameter-value-coverage-pvc/| title = Unit Testing with Parameter Value Coverage (PVC)}}</ref> For example, common values for a string are: 1) [[Null object|null]], 2) empty, 3) whitespace (space, tabs, newline), 4) valid string, 5) invalid string, 6) single-byte string, 7) double-byte string. It may also be appropriate to use very long strings. Failure to test each possible parameter value may result in a bug. Testing only one of these could result in 100% code coverage as each line is covered, but as only one of seven options are tested, there is only 14.2% PVC.