@Test
public void testValidNonHaConfig()  throws IllegalArgumentException {

  // username: hdfsuser
  // password: hdfsuser
  // hadoop.security.authentication: simple
  // fs.default.name: hdfs://node-2.example.com:8020
  Map<String, String> configs = new HashMap<String, String>();
  configs.put("username", "hdfsuser");
  configs.put("password", "hdfsuser");
  configs.put("hadoop.security.authentication", "simple");
  configs.put("fs.default.name", "hdfs://node-2.example.com:8020");
  HdfsClient.validateConnectionConfigs(configs);
}