Macro reach_tests 

macro_rules! reach_tests {
    ($app:ty) => { ... };
    ($app:ty, shares: [$($test:ident),+ $(,)?] $(, long: [$($long:literal),* $(,)?])? $(,)?) => { ... };
}

Declare the test that a drive of every scenario of an app reaches every action it publishes (framework::testing::check_scenarios_reach_every_action, built with test-support): none is advertised yet handled only by a click. The scenarios stage fixtures; the app someone opens acts on this machine (its files, its processes), so it is not walked.

reach_tests!(Shell) declares one test. An app whose scenarios take long to walk names one test per share, shares: [share_0, share_1], which run side by side and together walk every scenario; long: ["scenario"] names scenarios publishing so many actions (one set per row of a long list) that every share asks its own part of them.