[GitHub] jena issue #379: Refactor tests; don't test for GregorianYear< 0

[ajs6f]

Github user ajs6f commented on the issue:

    https://github.com/apache/jena/pull/379
  
    Ok, `testDateTime_9` LGTM and if the others are just cut-and-paste, it 
should all be good.


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