### Question:
StringType implements Type, Serializable { @Override public JsonNode toJson(JsonNodeFactory factory, Object obj) { return factory.textNode((String) cast(obj)); } private  StringType(); @Override String getName(); @Override boolean supportsEq(); @Override boolean supportsOrdering(); @Override JsonNode toJson(JsonNodeFactory factory, Object obj); @Override Object fromJson(JsonNode node); @Override Object cast(Object obj); @SuppressWarnings({"rawtypes", "unchecked"}) @Override int compare(Object v1, Object v2); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString(); static final Type TYPE; static final String NAME; }### Answer:
@Test public void testToJson() { JsonNodeFactory jsonNodeFactory = new JsonNodeFactory(true); JsonNode jsonNode = stringType.toJson(jsonNodeFactory, "json"); assertTrue(new Boolean(jsonNode.asText().equals("json"))); }