GetCharTest([startAt])
Test the Psychtoolbox function "
GetChar".
For platforms such as OS X where
GetCharTest is divided into subtests,
begin at subtest "startAt" if it is in the allowable range. Otherwise
ignore the argument and begin with the first subtest.
GetCharTest tests
GetChar for likely failure modes. It also tests associated
functions for character events, such as
CharAvail,
ListenChar and
FlushEvents.
Psychtoolbox/PsychTests/GetCharTest.m