Github user dragonsinth commented on the pull request:
https://github.com/apache/curator/pull/148#issuecomment-220502769
Weird, I don't know what's up with the branch syncing.
Basically, the root node transitions between LIVE <-> DEAD depending on
whether it exists or not. Child nodes can only transition PENDING -> LIVE ->
DEAD; a child node isn't allowed to go from DEAD -> LIVE; instead it's replaced
with a new child node at the same spot. That's the source of the double event,
I think, although I didn't dig deep enough to fully understand it. So this
test is saying, if you're going PENDING -> LIVE then fire an ADD event; if
you're the root then DEAD -> LIVE is allowed to fire an ADD event too.
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