Documentation coverage is calculated only for all statement of the file, even decorators.
Private functions are not part of the calculation.
--coverageTest gives the ability to test under a CI context the level of documentation coverage.
--coverageMinimumPerFile gives the ability to specify a minimum of coverage per file.
--coverageTestThresholdFail gives the ability to specify if command will fail with error or just warn user (true: error, false: warn) (default: true)