### Question:
DataRow extends HashMap<String, Object> { public long getVersion() { return version; } DataRow(Map<String, ?> map);  DataRow(int initialCapacity); long getVersion(); long getReplacesVersion(); void setReplacesVersion(long replacesVersion); DataRow applyDiff(DataRow diff); DataRow createDiff(DataRow row); ObjectId createTargetObjectId(String entityName, DbRelationship relationship); @Override String toString(); String getEntityName(); void setEntityName(String entityName);  }### Answer:
@Test public void testVersion() throws Exception { DataRow s1 = new DataRow(10); DataRow s2 = new DataRow(10); DataRow s3 = new DataRow(10); assertFalse(s1.getVersion() == s2.getVersion()); assertFalse(s2.getVersion() == s3.getVersion()); assertFalse(s3.getVersion() == s1.getVersion()); }