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https://issues.apache.org/jira/browse/ZOOKEEPER-694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843358#action_12843358
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Patrick Hunt commented on ZOOKEEPER-694:
----------------------------------------

Consider using mockito, other parts of Hadoop have moved to this and I think we 
should too (3.4.0 would be good).

ps I tried moving ZooKeeper to being an interface a long time back but was 
outvoted. :-(


> Add unit tester for Zookeeper
> -----------------------------
>
>                 Key: ZOOKEEPER-694
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-694
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client, tests
>            Reporter: David Rosenstrauch
>            Priority: Minor
>             Fix For: 3.4.0
>
>
> It would be nice to have a mock/fake version of 
> org.apache.zookeeper.Zookeeper that could be used for unit testing.  i.e., a 
> single instance Zookeeper that operates completely in memory, with no network 
> or disk I/O.
> This would make it possible to pass one of the memory-only fake Zookeeper's 
> into unit tests, while using a real Zookeeper in production code.
> i.e., maybe something like this:
> public interface ZooKeeperService {
> ...
> }
> public class ZooKeeperTester implements ZooKeeperService {
> ...
> (stand-alone, in-memory, test implementation)
> ...
> }
> public class ZooKeeper implements ZooKeeperService {
> ...
> ("real" implementation)
> ...
> }

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