@Test
public void testListCorrupted() throws Exception {

    String json = "[{\"k1\":[\"v1\",\"v2\",\"v3\",\"v4\",\"v4\"],\"k2\":\"v1\"}," +
            "\"k3\":[\"v1\",\"v2\",\"v3\",\"v4\",\"v4\"],\"k4\":\"v1\"}]";
    List<Metadata> m = JsonMetadataList.fromJson(null);
    assertNull(m);
}