Hi Jens,
Sorry for the slow reply.
Usually when I write tests, I don't actually use the RPC system, but rather
have the client call the server directly running in the same thread.
Remember that you can implicitly turn an `Own<MyInterface::Server>` into a
`MyInterface::Client`, and then call it like a client:
MyInterface::Client client = kj::heap<MyServerImpl>();
In theory, whether or not you have an actual RPC connection in between
should be transparent.
-Kenton
On Mon, Feb 21, 2022 at 11:47 AM Jens Alfke <j...@mooseyard.com> wrote:
> Does anyone have advice on writing C++ automated tests for RPC-based code?
> (FWIW, I use the Catch2 unit-test framework, but I don’t restrict it to
> true ‘unit’ tests.) Say I’ve got an interface file, a class `Client` built
> atop classes generated from that interface, and a class `Server` that
> accepts TCP connections from a `Client`. I want to write a test that
> creates a Client and Server, connects them to each other, and then invokes
> some operations on the Client and asserts the correct results.
>
> The first step of course is creating a connection. It looks like the
> simplest supported mechanism is to open a POSIX pipe and then create kj
> AsyncStreams on its two file descriptors. That means I’ll need an
> alternative Client constructor that takes a file descriptor or stream
> instead of a hostname/port…
>
> I’d love to take a look at anyone’s test code that does stuff like this.
>
> —Jens
>
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