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8d49452668
The clients, gateway and relay all employ an internal design that is based on an eventloop. This gives us a lot of control in how various IO components interact with each other. Great control also comes with a source of bugs, the latest of which made the relay busy-loop once it started relaying some traffic. Eventloops are notoriously hard to unit-test because they compose various IO bits together. Instead of writing unit tests, we can go and assert the process state after the performance tests. Those generate a fair bit of load on all our components but after that, they should suspend. The most effective tests survive even large refactorings and for that, they need to be coded against a stable API / property. Asserting that the process sleeps when it is idle from an application PoV is such a property. Related: #4511.