1. create a file, write it twice, delete it (events polled afterwards):
    ENTRY_CREATE count=1 context=a.txt
    ENTRY_MODIFY count=2 context=a.txt
    ENTRY_DELETE count=1 context=a.txt
2. Files.writeString of 100 KiB to a new file (one call):
    ENTRY_CREATE count=1 context=b.txt
    ENTRY_MODIFY count=1 context=b.txt
3. 50 appends to one file with no polling in between, then poll:
    {(batches)=1, ENTRY_MODIFY=9}
4. Files.move (atomic rename) of g.txt to h.txt:
    ENTRY_DELETE count=1 context=g.txt
    ENTRY_CREATE count=1 context=h.txt
5. a file created inside a NEW subdirectory (subdirectory not registered):
    ENTRY_CREATE count=1 context=sub
6. burst: create N empty files in a fresh directory before polling once (jdk.nio.file.WatchService.maxEventsPerPoll=default):
    N=100   delivered 100  events: ENTRY_CREATE=100  OVERFLOW(count)=0, files on disk=100
    N=512   delivered 512  events: ENTRY_CREATE=512  OVERFLOW(count)=0, files on disk=512
    N=513   delivered 1    events: ENTRY_CREATE=0    OVERFLOW(count)=1, files on disk=513
    N=5000  delivered 1    events: ENTRY_CREATE=0    OVERFLOW(count)=4488, files on disk=5000