@Test
public void testRenderMultiValueMap() throws IOException {

  Map<String, List<String>> map = new LinkedHashMap<>();
  map.put("ZOOKEEPER", Collections.singletonList("ZOOKEEPER_SERVER"));
  map.put("MAPREDUCE2", Collections.singletonList("HISTORYSERVER"));
  map.put("HDFS", Collections.singletonList("DATANODE"));
  assertEquals(IOUtils.toString(new FileInputStream(new File("src/test/resources/2columns"))),
    TableRenderer.renderMultiValueMap(map, "SERVICE", "COMPONENT"));
}