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ImpInProcessNode vs a UbosNodeDriver
https://feditest.org/reference/node-and-constellation-types/imp-vs-ubos-node-driver/
Purpose: Protocol-level Testing.
About this constellation type
The ImpInProcessNodeDriver is the Node Driver for a special-purpose
Diagnostic Node that runs the Imp and can act only as a client.
It is built into FediTest (well, it is one of the files in the default distribution) and
used as the client for Protocol-level Testing conformance of WebFinger servers.
For more info about UbosNodeDrivers, see description in Constellations created with UbosNodeDrivers.
Recommended for
Protocol-level Testing WebFinger tests of applications that aren’t deployed publicly in the cloud yet and for which a UbosNodeDriver exists.