The idea is that it would contain implementations of every single event-related function allowed, all with easily discernible effects. This could then be used to manually test that all interaction events work as expected, and as an illustration of how to use each one. (Even better if it could be used for automated tests of events; not sure how likely that is with our current test framework, but if we get end-to-end tests running then presumably that test harness will have a way to simulate various events.)
The idea is that it would contain implementations of every single event-related function allowed, all with easily discernible effects. This could then be used to manually test that all interaction events work as expected, and as an illustration of how to use each one. (Even better if it could be used for automated tests of events; not sure how likely that is with our current test framework, but if we get end-to-end tests running then presumably that test harness will have a way to simulate various events.)