diff --git a/ext/unicode/unicode.go b/ext/unicode/unicode.go
index 4a75aa0..c47ec5f 100644
--- a/ext/unicode/unicode.go
+++ b/ext/unicode/unicode.go
@@ -45,13 +45,7 @@ func Register(db *sqlite3.Conn) {
 				return
 			}
 
-			tag, err := language.Parse(arg[0].Text())
-			if err != nil {
-				ctx.ResultError(err)
-				return
-			}
-
-			err = db.CreateCollation(name, collate.New(tag).Compare)
+			err := RegisterCollation(db, name, arg[0].Text())
 			if err != nil {
 				ctx.ResultError(err)
 				return
@@ -59,6 +53,14 @@ func Register(db *sqlite3.Conn) {
 		})
 }
 
+func RegisterCollation(db *sqlite3.Conn, name, lang string) error {
+	tag, err := language.Parse(lang)
+	if err != nil {
+		return err
+	}
+	return db.CreateCollation(name, collate.New(tag).Compare)
+}
+
 func upper(ctx sqlite3.Context, arg ...sqlite3.Value) {
 	if len(arg) == 1 {
 		ctx.ResultBlob(bytes.ToUpper(arg[0].RawBlob()))