Refactoring: user fixtures in sql tests

src/test/sql/fixtures/fixture_user.sql

@@ -0,0 +1,16 @@
+create or replace function fixture_user(in name text default 'george', out user_id uuid)
+    language plpgsql as
+$$
+declare
+    created_user1 json  := '{"username": "george", "plain_password": "azerty", "roles": ["ROLE_USER"]}';
+    created_user2 json  := '{"username": "john", "plain_password": "qwerty", "roles": ["ROLE_USER"]}';
+begin
+    if (name = 'george') then
+        select insert_user(created_user1) into created_user1;
+        user_id := created_user1->>'id';
+    elseif (name = 'john') then
+        select insert_user(created_user2) into created_user2;
+        user_id := created_user2->>'id';
+    end if;
+end
+$$