Document helpful testing techniques that can boost quality of life for individual projects

[NullVoxPopuli]

Things like

• Custom QUnit checkboxes!!
• Assigning getSettledState / getPendingWaiterState to window (so you can see what's holding up your test live!)
• why / how is a property changing? (example: observing an effect ruin your day) -- intercept it with a getter/setter pair or just put a breakpoint in source (node_modules chunk/vendor/etc) if the code already has a setter (like if you need to figure out what is setting an ember-data @attr (my day today, oof 🙈 ))
• macroCondition(....) (test-only or dev-only code)