Assert.assertEquals("there should be exactly one version",1,list1.size());
Assert.assertEquals("contents of version differ", version1, list1.get(0));
Version version2 = new Version();
version2.setCommitTime(new Date());
version2.addTriple(triple2);
version2.removeTriple(triple1);
connection.storeVersion(version2);
connection.commit();
// check if listVersions now gives exactly two versions