Sqlite: table constraint and triggers

I know the order of triggers in SQLite is undefined (you cannot be sure what trigger will be executed first), but, how about the relationship between table constraints and triggers?

I mean, suppose I have, for example, a UNIQUE constraint in any column, and a BEFORE and AFTER UPDATE triggers on that table. If the UNIQUE column is modified, when does sqlite check the UNIQUE constraint? before calling BEFORE triggers, after calling AFTER triggers, between them, or with undefined order?

I have find nothing in SQL docs.