tst_QStorageInfo fails on macos

********* Start testing of tst_QStorageInfo *********
Config: Using QtTest library 5.12.0, Qt 5.12.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by Clang 9.1.0 (clang-902.0.39.2) (Apple))
PASS   : tst_QStorageInfo::initTestCase()
PASS   : tst_QStorageInfo::defaultValues()
QINFO  : tst_QStorageInfo::dump() Filesystem (Type)            Size  Available BSize  Label            Mounted on
QINFO  : tst_QStorageInfo::dump() /dev/disk1s1 (apfs) RW  976900220  264314844  4096  RoadWarrior               /
PASS   : tst_QStorageInfo::dump()
PASS   : tst_QStorageInfo::operatorEqual()
PASS   : tst_QStorageInfo::operatorNotEqual()
PASS   : tst_QStorageInfo::root()
PASS   : tst_QStorageInfo::currentStorage()
PASS   : tst_QStorageInfo::storageList()
FAIL!  : tst_QStorageInfo::tempFile() 'free != storage2.bytesFree()' returned FALSE. ()
   Loc: [/Users/erik/dev/qt5-dev/qtbase/tests/auto/corelib/io/qstorageinfo/tst_qstorageinfo.cpp(198)]
FAIL!  : tst_QStorageInfo::caching() 'free != storage2.bytesFree()' returned FALSE. ()
   Loc: [/Users/erik/dev/qt5-dev/qtbase/tests/auto/corelib/io/qstorageinfo/tst_qstorageinfo.cpp(224)]
PASS   : tst_QStorageInfo::cleanupTestCase()
Totals: 9 passed, 2 failed, 0 skipped, 0 blacklisted, 18ms
********* Finished testing of tst_QStorageInfo *********