On macOS 10.14 (clang-x86_64) I've seen repeated failures of

FAIL!  : tst_QTcpSocket::bind(WithoutProxy:[::]:1) '!socket->bind(addr, port)' returned FALSE. ()
   Loc: [../tst_qtcpsocket.cpp(619)]

FAIL!  : tst_PlatformSocketEngine::bind() '!binder.bind(QHostAddress::AnyIPv4, 82)' returned FALSE. ()
   Loc: [tst_platformsocketengine.cpp(535)]

These are both Unix-only tests of low port numbers, which are normally privileged, so I presume the tests expect bind() to fail based on the test process not having the needed privilege to bind to these ports.
I've only seen this failure on dev, when testing a change before integration.
It's possible macOS 10.14 is new in dev and/or the Coin config for it uses a more privileged account than usual to run tests.