protected void testXml(CacheCreation creation) throws IOException {
    testXml(creation, true);
  }
Uses the {@link CacheXmlGenerator} to generate an XML file from the given
{@link CacheCreation}. It then creates a {@link Cache} from the XML and asserts that it is the
same as the cache described in the <code>CacheCreation</code>.

@param creation the {@link CacheCreation} from which to generate an XML file
@throws IOException if an exception is encountered when writing the XML file
geode-dunit/src/main/java/org/apache/geode/cache30/CacheXmlTestCase.java