withActor() replaced the whole TransportRegistry with a fresh one holding a
single transport named "testing". AuthTransportMiddleware, which is how
HttpAuthBootloader wires auth into an application, asks the registry for a
transport by name, so a request through it died with
Spiral\Auth\Exception\TransportException: Undefined auth transport header
AuthMiddleware kept working because it iterates over every transport, which is
why the failure looked like it only happened with a custom transport.
The fake registry is now built from the names the application has configured,
each mapped to the same fake HeaderTransport that reads X-Test-Token, so
whichever name the middleware asks for it gets a transport that finds the test
token. "testing" stays and becomes the default. An application with no registry
bound behaves as before.
The test app had no withActor() coverage at all, so the three tests come with
two middleware stubs: one that runs AuthTransportMiddleware('header') resolved
from the http scope, one that reports the actor into the response body.
For spiral/framework#1231
upstream
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