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test: make the client concurrency tests deterministic - #411
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The runtime takes a control pool and a timer through package-private builder methods, so tests step through control tasks and fire timeouts themselves. createPeer is split into register and open, the points a closing runtime can meet it at. New tests cover SerialExecutor rejection, createPeer against close at each point, answers that arrive after the session timed out, and how close failures are reported; the HTTP test endpoint holds answers on a latch instead of sleeping.
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The client API's race tests relied on sleeps, racing timeouts and repeated attempts. They now decide the interleaving themselves:
WebRtc.Buildertakes a control pool and a timer through package-private methods; tests pass aManualExecutorand aManualTimerand step through tasks and timeouts.createPeeris split intoregisterandopen, the points where a closing runtime can meet it.SerialExecutorrejection,createPeeragainstcloseat each point, WHIP/WHEP answers that arrive after the session timed out, and how close failures are reported.TestHttpEndpointholds answers on a latch instead of sleeping.