Reference
Testing Functions
Use these functions in implementing your own tests.
Other Functions
Use these functions to test for availability and version information for optional functionality and to check the version of the installed MP-Test.
Tests of MP-Test
These functions test that MP-Test is installed and functioning as expected.
Private Functions
The following are private functions that implement detection of specific
optional functionality. They are not intended to be called directly, but
rather are used to extend the capabilities of have_feature()
(see above).