### Question:
JSONUtils { public static String findValue(JsonNode jsonNode, String fieldName) { JsonNode node = jsonNode.findValue(fieldName); if (node == null) { return null; } return node.toString(); } private  JSONUtils(); static ArrayNode createArrayNode(); static ObjectNode createObjectNode(); static JsonNode toJsonNode(Object obj); static String toJsonString(Object object, SerializationFeature feature); static T parseObject(String json, Class<T> clazz); static List<T> toList(String json, Class<T> clazz); static boolean checkJsonValid(String json); static String findValue(JsonNode jsonNode, String fieldName); static Map<String, String> toMap(String json); static Map<K, V> toMap(String json, Class<K> classK, Class<V> classV); static String toJsonString(Object object); static ObjectNode parseObject(String text); static ArrayNode parseArray(String text);  }### Answer:
@Test public void testFindValue() { Assert.assertNull(JSONUtils.findValue( new ArrayNode(new JsonNodeFactory(true)), null)); }