These tests ensure that the different fuchsia.io clients and servers can interop successfully. It does this by setting up specific node and directory layouts using fuchsia.io server libraries. Thereafter:
The server handling of various protocol invariants are validated using FIDL.
The correct operation of client libraries are tested against these specific layouts.
In order to set up servers in different languages, we create a test driver for each filesystem server. A test driver will be a component that could be launched by the conformance test suite on demand, and serve a number of directories via the fuchsia.io.test FIDL protocol, using a specific filesystem library.