This change adds EventClassesTest class to bb/tests/event.py,
including 47 new test cases for the public interfaces of the
bitbake event and related helper classes.
[YOCTO #10773]
(Bitbake rev: ee5fe4431713b8a29bdb424a29460965374b3234)
Signed-off-by: Jair Gonzalez <jair.de.jesus.gonzalez.plascencia@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>