test: extensions schema

tests that there are default extensions included in the "extensions"
schema.

Author: steve-chavez

Diff for: nix/tests/expected/extensions_schema.out

@@ -0,0 +1,22 @@
+-- all default extensions are installed in a schema "extensions"
+-- we don't include the version as that will break often, we only care about
+-- ensuring these extensions are present
+select
+    e.extname as extension_name,
+    n.nspname as schema_name,
+    e.extowner::regrole as extension_owner
+from
+    pg_extension e
+join
+    pg_namespace n on e.extnamespace = n.oid
+where
+    n.nspname = 'extensions' and e.extname != 'pgjwt'
+order by
+    e.extname;
+   extension_name   | schema_name | extension_owner 
+--------------------+-------------+-----------------
+ pg_stat_statements | extensions  | supabase_admin
+ pgcrypto           | extensions  | supabase_admin
+ uuid-ossp          | extensions  | supabase_admin
+(3 rows)
+

Diff for: nix/tests/sql/extensions_schema.sql

@@ -0,0 +1,15 @@
+-- all default extensions are installed in a schema "extensions"
+-- we don't include the version as that will break often, we only care about
+-- ensuring these extensions are present
+select
+    e.extname as extension_name,
+    n.nspname as schema_name,
+    e.extowner::regrole as extension_owner
+from
+    pg_extension e
+join
+    pg_namespace n on e.extnamespace = n.oid
+where
+    n.nspname = 'extensions' and e.extname != 'pgjwt'
+order by
+    e.extname;