Speed up junit tests
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                 Key: LUCENE-1844
                 URL: https://issues.apache.org/jira/browse/LUCENE-1844
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Mark Miller


As Lucene grows, so does the number of JUnit tests. This is obviously a good 
thing, but it comes with longer and longer test times. Now that we also run 
back compat tests in a standard test run, this problem is essentially doubled.

There are some ways this may get better, including running parallel tests. You 
will need the hardware to fully take advantage, but it should be a nice gain. 
There is already an issue for this, and Junit 4.6, 4.7 have the beginnings of 
something we might be able to count on soon. 4.6 was buggy, and 4.7 still 
doesn't come with nice ant integration. Parallel tests will come though.

Beyond parallel testing, I think we also need to concentrate on keeping our 
tests lean. We don't want to sacrifice coverage or quality, but I'm sure there 
is plenty of fat to skim.

I've started making a list of some of the longer tests - I think with some work 
we can make our tests much faster - and then with parallelization, I think we 
could see some really great gains.

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