add -Dtests.codecprovider
-------------------------

                 Key: LUCENE-3076
                 URL: https://issues.apache.org/jira/browse/LUCENE-3076
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Robert Muir
             Fix For: 4.0


Currently to test a codec (or set of codecs) you have to add them to lucene's 
core and edit a couple of arrays here and there...

It would be nice if when using the test-framework you could instead specify a 
codecprovider by classname (possibly containing your own set of huper-duper 
codecs).

For example I made the following little codecprovider in contrib:
{noformat}
public class AppendingCodecProvider extends CodecProvider {
  public AppendingCodecProvider() {
    register(new AppendingCodec());
    register(new SimpleTextCodec());
  }
}
{noformat}

Then, I'm able to run tests with 'ant -lib 
build/contrib/misc/lucene-misc-4.0-SNAPSHOT.jar test-core 
-Dtests.codecprovider=org.apache.lucene.index.codecs.appending.AppendingCodecProvider',
 and it always picks from my set of  codecs (in this case Appending and 
SimpleText), and I can set -Dtests.codec=Appending if i want to set just one.



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