### Question:
MultipleFieldStringSerializer { public static final String serialize(String... fields) { return Stream.of(fields).collect(Collectors.joining(FIELD_SEPARATOR)); }  static final String serialize(String... fields); static List<String> deserialize(String value); static final String serializeSubfields(String... fields); static List<String> deserializeSubfields(String value); static final String FIELD_SEPARATOR; static final String SUBFIELD_SEPARATOR; }### Answer:
@Test public void testSerialize() throws Exception { Assert.assertEquals(SERIALIZED_FIELDS, MultipleFieldStringSerializer.serialize(DESERIALIZED_FIELDS)); }