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https://issues.apache.org/jira/browse/CASSANDRA-7466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088070#comment-14088070
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Jonathan Ellis commented on CASSANDRA-7466:
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[~JoshuaMcKenzie] to review
> Unit Test Suite Breaks when Run in a Single JVM
> -----------------------------------------------
>
> Key: CASSANDRA-7466
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7466
> Project: Cassandra
> Issue Type: Bug
> Components: Tests
> Environment: MacOS 10.9.3, IntelliJ IDEA 13.1.3, Java 1.7.0_51
> Reporter: Caleb William Rackliffe
> Assignee: Caleb William Rackliffe
> Priority: Minor
> Labels: unit-test
> Attachments: trunk-7466.txt
>
>
> Note: Instead of picking a version below, I'll simply note that I'm on
> {{trunk}} at commit {{c027183ea4e901cf1d44e06704f6d78f84405bb4}}
> I pulled down the source and followed
> http://wiki.apache.org/cassandra/RunningCassandraInIDEA to import C* as an
> IDEA project. Everything in the tutorial works as it should, but when I tried
> to run the unit tests in {{test/unit/org.apache.cassandra}}, the suite failed
> a couple tests in, complaining that it couldn't find the {{system}} keyspace
> in {{build/test/cassandra/data}}.
> tl;dr static initialization makes it hard to run the unit tests in the same
> JVM
> The full story is that...
> 1.) When the first test in the suite is run, the {{system}} keyspace is
> created on disk and in the in-memory schema.
> 2.) Many subsequent tests, like {{BlacklistingCompactionsTest}}, remove the
> {{system}} keyspace directory (among other things) in {{defineSchema()}} with
> a call to {{SchemaLoader.prepareServer()}}.
> 3.) While these tests create the keyspaces they require, they do *not*
> recreate the system keyspace, and so they fail when they force a compaction
> or perform any other action that goes looking for it.
> You can run the suite with IDEA's class/method forking, and you get a little
> bit better results, but it still seems like this shouldn't be necessary.
> I guess there are two ways to fix it:
> 1.) We rebuild the system keyspace before for each test.
> 2.) We leave the system keyspace alone.
> I took a hack at #1 in the attached patch. It looks like it to fixes this
> specific problem, but I'm not super-believable in this codebase yet...
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