Simple framework for testing code that has a concept of a 'frame' or a 'tick', e.g. tests that run in rendering frameworks, or tests that perform a lot of asynchronous calls.
For each tick, no more than one test is executed. Tests can be paused
(Test::Wait()) and resumed (Test::Resume()). When a test fails,
no more test code is executed and the next test will run at the next
tick.
See sample/sample.cpp for a trivial example.