dirwatcher test is flakey on OSX+LDC

[Geod24]

+echo '[INFO] Running test tests/dirwatcher.d'
[INFO] Running test tests/dirwatcher.d
+dub --temp-build --compiler=ldc2 --single tests/dirwatcher.d
Performing "debug" build using ldc2 for x86_64.
taggedalgebraic 0.11.8: target for configuration "library" is up to date.
eventcore 0.8.48: target for configuration "kqueue" is up to date.
stdx-allocator 2.77.5: target for configuration "library" is up to date.
vibe-core 1.8.1+commit.3.g18bb563: target for configuration "kqueue" is up to date.
tests ~master: building configuration "application"...
tests/dirwatcher.d(35,16): Deprecation: alias `vibe.core.path.Path` is deprecated - Use NativePath or one the specific path types instead.
tests/dirwatcher.d(46,74): Deprecation: alias `vibe.core.path.Path` is deprecated - Use NativePath or one the specific path types instead.
tests/dirwatcher.d(76,12): Deprecation: alias `vibe.core.path.Path` is deprecated - Use NativePath or one the specific path types instead.
Linking...
To force a rebuild of up-to-date targets, run again with --force.
Running ../../../../../var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/.dub/build/tests-~master/application-debug-posix.osx-x86_64-ldc_2084-334A508186D74F687CCE79AE42BDCF8E/tests 
Test failed: core.exception.AssertError@tests/dirwatcher.d(51): Change is not what was expected, got: [DirectoryChange(modified, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(modified, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(removed, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(added, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar), DirectoryChange(modified, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar), DirectoryChange(removed, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar)] but expected: [DirectoryChange(added, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(modified, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(removed, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/foo), DirectoryChange(added, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar), DirectoryChange(modified, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar), DirectoryChange(removed, /var/folders/nz/vv4_9tw56nv9k3tkvyszvwg80000gn/T/dirwatcher_test_2440/subdir/bar)]
----------------
??:? _d_assert_msg [0x10177c296]
dirwatcher.d:51 @safe void dirwatcher.runTest().check(vibe.core.file.DirectoryChange[]) [0x10150c12a]
dirwatcher.d:88 void dirwatcher.runTest() [0x10150b8d6]
dirwatcher.d:104 void dirwatcher.main().__lambda1() [0x10150c5e8]
task.d:656 void vibe.core.task.TaskFuncInfo.set!(void delegate()).set(ref void delegate()).callDelegate(ref vibe.core.task.TaskFuncInfo) [0x101524639]
sync.d:1135 void vibe.core.task.TaskFuncInfo.call() [0x1015df801]
sync.d:165 nothrow void vibe.core.task.TaskFiber.run() [0x1015deff8]
??:? fiber_entryPoint [0x101785af3]
Program exited with code 1
The command "./travis-ci.sh" exited with 2.