tst_QDateTime::timeZoneAbbreviation() failed on macOS 10.13

agent:2018/08/23 21:05:03 build.go:307: [make check -j1] 900 900
agent:2018/08/23 21:05:03 build.go:187: /Users/qt/work/qt/qtbase/tests/auto/corelib/tools/qdatetime/target_wrapper.sh  ./tst_qdatetime -o /Users/qt/work/testresults/tests/auto/corelib/tools/qdatetime418949302,xml -o -,txt
agent:2018/08/23 21:05:03 build.go:187: ********* Start testing of tst_QDateTime *********
agent:2018/08/23 21:05:03 build.go:187: Config: Using QtTest library 5.12.0, Qt 5.12.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 9.1.0 (clang-902.0.39.2) (Apple))
agent:2018/08/23 21:05:03 build.go:187: QDEBUG : tst_QDateTime::initTestCase() Current local time detected to be ahead of UTC but isn't the Central European timezone
agent:2018/08/23 21:05:03 build.go:187: PASS   : tst_QDateTime::initTestCase()
...
agent:2018/08/23 21:05:04 build.go:187: FAIL!  : tst_QDateTime::timeZoneAbbreviation() Compared values are not the same
agent:2018/08/23 21:05:04 build.go:187:    Actual   (dt5.timeZoneAbbreviation()): "GMT+1"
agent:2018/08/23 21:05:04 build.go:187:    Expected (cet)                       : "CET"
agent:2018/08/23 21:05:04 build.go:187:    Loc: [tst_qdatetime.cpp(2744)]
agent:2018/08/23 21:05:04 build.go:187: PASS   : tst_QDateTime::getDate()
...
agent:2018/08/23 21:05:04 build.go:187: PASS   : tst_QDateTime::cleanupTestCase()
agent:2018/08/23 21:05:04 build.go:187: Totals: 446 passed, 1 failed, 30 skipped, 0 blacklisted, 432ms
agent:2018/08/23 21:05:04 build.go:187: ********* Finished testing of tst_QDateTime *********
agent:2018/08/23 21:05:04 build.go:187: make: *** [check] Error 1
agent:2018/08/23 21:05:04 build.go:231: Process finished with error: exit status 2
agent:2018/08/23 21:05:04 build.go:190: Error reading from stdout/err: exit status 2