startProbe property
The probe of the tests for a check that runs on a device, such as the
start check, or null if they have none: a function that goes through
what the tests check in the running app, without a test framework, and
returns what is wrong, such as the walk of the routes of the app.
The matrix lists the probes of the tests that it adds to an app with a test that runs them (readsStartProbes); see addAppTests.
A probe depends on no other probe. It holds whichever probes ran before it, on whatever screen they left the app, and whichever guards of the routes allow on the device, where no mocks open one: the walk of the routes expects the target of a guard in place of each location that the guard keeps the user from.
Implementation
final MatrixStartProbe? startProbe;