class DriverUnderTest

This is a RAII wrapper over a driver under test. On construction it initializes the driver server

and on destruction it destroys the driver server.

The |Driver| type given in the template is used to provide pass-through `->` and `*` operators

to the given driver type.

To use this class, ensure that the driver has been exported into the

__fuchsia_driver_registration__ symbol using the FUCHSIA_DRIVER macros. Otherwise pass the

DriverRegistration manually into this class.

# Thread safety

This class is thread-unsafe. Instances must be managed and used from a synchronized dispatcher.

See

https://fuchsia.dev/fuchsia-src/development/languages/c-cpp/thread-safe-async#synchronized-dispatcher

If the driver dispatcher is the foreground dispatcher, the DriverUnderTest does not need to be

wrapped in a DispatcherBound.

If the driver dispatcher is a background dispatcher, the suggestion is to

wrap this inside of an |async_patterns::TestDispatcherBound|.

The driver registration's initialize and destroy hooks are executed from the context of the

dispatcher that this object lives on, therefore the driver's initial dispatcher will be this

same dispatcher.