1485075 - Consider more complex policies for 'mach try coverage'

Status: NEW

(Testing :: Code Coverage, enhancement)

Description

[Gabriel Vîjială [:gabriel-v]]

This is a follow up bug suggested by Marco in review comment https://phabricator.services.mozilla.com/D3115#inline-13912.

In the current implementation, when there are files that are not covered by tests, no tests are run for it.

> We might want to do something different when there are files with no coverage
> information, e.g. run everything, or do different things based on the type of
> the file (for example: if it is Python, then run everything; if it is a plain
> text file, don't run anything).

We might even want to ask the user to run 'mach try all' themselves, instead of running it for them?