If the check library is not available, use an abbreviated implementation of the check API.  This allows the unit and regression tests to be run on any system without requiring an external package.
If the check library is not available, use an abbreviated implementation of
the check API.  This allows the unit and regression tests to be run on any
system without requiring an external package.

markpizz/expat,markpizz/expat,markpizz/expat