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Running affected:test in parallel shows karma errors #606

@Nxt3

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@Nxt3

I get the following error when running yarn affected:test --parallel --all:

 30% building modules 170/171 modules 1 active …ary-nav/secondary-nav-item.component.js25 06 2018 10:33:17.737:ERROR [karma]: { Error: listen EADDRINUSE 0.0.0.0:9876
    at Object._errnoException (util.js:1022:11)
    at _exceptionWithHostPort (util.js:1044:20)
    at Server.setupListenHandle [as _listen2] (net.js:1351:14)
    at listenInCluster (net.js:1392:12)
    at doListen (net.js:1501:7)
    at _combinedTickCallback (internal/process/next_tick.js:141:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
  code: 'EADDRINUSE',
  errno: 'EADDRINUSE',
  syscall: 'listen',
  address: '0.0.0.0',
  port: 9876 }

This happens for each test. It's not failing tests--but it's shown in the output and I'd like to fix it if possible.

Running sequentially is fine.

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