Create tests for measuring glitches and latency

[gavv]

Roc already has unit and integration tests, but they, by design, have limitations:

• they are run frequently during development, so they should not take long
• they are run everywhere (on developer machine, on CI), so should not be sensitive to real-time (e.g. tests should pass even on loaded machine like CI VM worker)
• they are yes/no tests, i.e. should either succeed or fail

We want to develop a new set of real-time tests:

• running on real hardware on unloaded system
• running long if needed
• providing metrics, not just success or failure
• testing various real-time aspects of the toolkit, for example latency, number of glitches, etc

These new tests will live in a separate repo: rt-tests.

Currently, the new repo has a build system, and a skeleton of one test that implements full loopback: writes audio stream to roc sender, obtains the stream from roc receiver, and runs a very basic check.

Now we need to develop a few actual tests:

• service quality test (measure number of glitches to check how roc copes with packet losses and delays)
• latency test (measure delay from sender to receiver)
• stress test (check invariants under intense load)
• and others

Please refer to rt-tests repo issues for more detailed description of each test:

• Create service quality test rt-tests#1
• Create latency test rt-tests#7
• Create stress test rt-tests#3

rt-tests repo uses C++17, cmake, and Google Test.