many, if not all, core pmcs are undertested. here's a brief survey of
obvious examples:
D:\usr\local\parrot\bug>ack -l --perl "tests => 1;" t\pmc
t\pmc\addrregistry.t
t\pmc\bound_nci.t
t\pmc\compiler.t
t\pmc\csub.t
t\pmc\default.t
t\pmc\deleg_pmc.t
t\pmc\enumerate.t
t\pmc\exception_handler.t
t\pmc\lexinfo.t
t\pmc\lexpad.t
t\pmc\multisub.t
t\pmc\null.t
t\pmc\parrotclass.t
t\pmc\parrotio.t
t\pmc\parrotlibrary.t
t\pmc\parrotthread.t
t\pmc\pointer.t
t\pmc\random.t
t\pmc\retcontinuation.t
t\pmc\scalar.t
t\pmc\sharedref.t
t\pmc\super.t
t\pmc\sys.t
t\pmc\tqueue.t
t\pmc\unmanagedstruct.t
t\pmc\version.t
t\pmc\vtablecache.t
surely we can do better. if you're going to attack one or more of
these items, feel free to open a ticket for a subset, and related it
as a child of this one.
~jerry