2014-07-02-15.45.59: src/lib/x-kit/widget/widget-unit-test.pkg:  Did a    checkbox_options =  [ gp::checkbox::LOOK_ARG  [  tli::BUTTON_PRESS_FN  button_press_fn  ] ]   and verified that the button_press_fn actually got called. That is the first successful end-to-end test: fake mousebutton-press propagated all the way down the Mythryl GUI+X stack, out through the X server, back up through the Mythryl X+GUI stack and invoked the application-level hook function for it. Whee! :-) :-) :-)