diff --git a/nix/tests/expected/default_privs.out b/nix/tests/expected/default_privs.out
new file mode 100644
index 000000000..862d10087
--- /dev/null
+++ b/nix/tests/expected/default_privs.out
@@ -0,0 +1,12 @@
+-- this tests the outcome of doing ALTER DEFAULT PRIVILEGES..
+select defaclrole::regrole, defaclnamespace::regnamespace, defaclobjtype from pg_default_acl where defaclnamespace = 'public'::regnamespace::oid order by defaclrole::regrole, defaclobjtype;
+   defaclrole   | defaclnamespace | defaclobjtype 
+----------------+-----------------+---------------
+ supabase_admin | public          | S
+ supabase_admin | public          | f
+ supabase_admin | public          | r
+ postgres       | public          | S
+ postgres       | public          | f
+ postgres       | public          | r
+(6 rows)
+
diff --git a/nix/tests/sql/default_privs.sql b/nix/tests/sql/default_privs.sql
new file mode 100644
index 000000000..5df2629b9
--- /dev/null
+++ b/nix/tests/sql/default_privs.sql
@@ -0,0 +1,2 @@
+-- this tests the outcome of doing ALTER DEFAULT PRIVILEGES..
+select defaclrole::regrole, defaclnamespace::regnamespace, defaclobjtype from pg_default_acl where defaclnamespace = 'public'::regnamespace::oid order by defaclrole::regrole, defaclobjtype;