@Test
public void testConvertMultimapToJson() {

    Multimap<String, Object> map = LinkedHashMultimap.create();
    map.put("a", 1);
    map.put("a", "1");
    map.put("a", 1.00);
    map.put("b", true);
    map.put("c", "hello");
    map.put("c", "hello world");
    String expected = "{\"a\":[1,\"1\",\"1.0D\"],\"b\":true,\"c\":[\"hello\",\"hello world\"]}";
    Assert.assertEquals(expected, Convert.mapToJson(map));
}