tst_QUdpSocket::broadcasting(WithoutProxy) and zeroLengthDatagram(WithoutProxy) failed on OS X

********* Start testing of tst_QUdpSocket *********
 Config: Using QtTest library 5.7.0, Qt 5.7.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 5.1 (clang-503.0.40) (Apple))
 PASS   : tst_QUdpSocket::initTestCase()
 QWARN  : tst_QUdpSocket::constructing(WithoutProxy) QIODevice::read (QUdpSocket): device not open
 PASS   : tst_QUdpSocket::constructing(WithoutProxy)
 PASS   : tst_QUdpSocket::unconnectedServerAndClientTest(WithoutProxy)
 FAIL!  : tst_QUdpSocket::broadcasting(WithoutProxy) Network operation timed out
    Loc: [../tst_qudpsocket.cpp(323)]
...
Totals: 51 passed, 2 failed, 4 skipped, 33 blacklisted, 54346ms
 ********* Finished testing of tst_QUdpSocket *********

********* Start testing of tst_QUdpSocket *********
 Config: Using QtTest library 5.7.0, Qt 5.7.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 5.1 (clang-503.0.40) (Apple))
...
FAIL!  : tst_QUdpSocket::zeroLengthDatagram(WithoutProxy) 'receiver.waitForReadyRead(1000)' returned FALSE. (local=0.0.0.0:58449, type=QAbstractSocket::SocketType(UdpSocket), state=QAbstractSocket::BoundState, error=QAbstractSocket::SocketTimeoutError: Network operation timed out)
    Loc: [../tst_qudpsocket.cpp(1086)]
...
Totals: 51 passed, 1 failed, 4 skipped, 34 blacklisted, 54148ms
 ********* Finished testing of tst_QUdpSocket *********