### Question:
EntityId { @Override public final String toString() { StringBuilder result = new StringBuilder(); result.append(entity.name().toLowerCase()); String separator = IDSTRING_TYPE_SEPARATOR; for (String part : toIdParts()) { result.append(separator).append(part); separator = IDSTRING_PART_SEPARATOR; } return result.toString(); } protected  EntityId(EntityType entity); static void ensureValidId(String propertyName, String name); static void ensureValidArtifactId(String propertyName, String name); static boolean isValidId(String name); static boolean isValidArtifactId(String name); static void ensureValidDatasetId(String propertyName, String datasetId); static boolean isValidDatasetId(String datasetId); static void ensureValidNamespace(String namespace); static boolean isValidNamespace(String namespace); static boolean isValidVersionId(String datasetId); abstract Iterable<String> toIdParts(); abstract String getEntityName(); MetadataEntity toMetadataEntity(); static T fromMetadataEntity(MetadataEntity metadataEntity); static T getSelfOrParentEntityId(MetadataEntity metadataEntity); final EntityType getEntityType(); static T fromString(String string); @Override final String toString(); @Override boolean equals(Object o); @Override int hashCode(); Iterable<EntityId> getHierarchy(); static final String IDSTRING_TYPE_SEPARATOR; static final String IDSTRING_PART_SEPARATOR; static final Pattern IDSTRING_PART_SEPARATOR_PATTERN; }### Answer:
@Test public void testCompatibility() { for (Map.Entry<? extends EntityId, String> toStringEntry : idsToString.entrySet()) { Assert.assertEquals(toStringEntry.getValue(), toStringEntry.getKey().toString()); } for (Map.Entry<? extends EntityId, String> toJsonEntry : idsToJson.entrySet()) { Assert.assertEquals(jsonToMap(toJsonEntry.getValue()), jsonToMap(GSON.toJson(toJsonEntry.getKey()))); } }