test: add test for duplicate entries in pg_description with same OID

test/spec/Feature/Query/ErrorSpec.hs

@@ -42,10 +42,10 @@ pgErrorCodeMapping = do
       it "works with SchemaCache error" $
         get "/non_existent_table"
           `shouldRespondWith`
-          [json| {"code":"PGRST205","details":null,"hint":"Perhaps you meant the table 'test.json_table'","message":"Could not find the table 'test.non_existent_table' in the schema cache"} |]
+          [json| {"code":"PGRST205","details":null,"hint":"Perhaps you meant the table 'test.collision_test_table'","message":"Could not find the table 'test.non_existent_table' in the schema cache"} |]
           { matchStatus  = 404
           , matchHeaders = [ "Proxy-Status" <:> "PostgREST; error=PGRST205"
-                           , "Content-Length" <:> "172" ]
+                           , "Content-Length" <:> "182" ]
           }
 
       it "works with Jwt error" $ do

test/spec/Feature/Query/RpcSpec.hs

@@ -1450,3 +1450,11 @@ spec =
           { matchStatus = 200
           , matchHeaders = [matchContentTypeJson]
           }
+
+    context "schema cache duplicate definitions when two entries in pg_description have the same OID" $
+      it "doesn't err with 300 Multiple Choices" $
+        request methodGet "/rpc/collision_test_func?id=1"
+          [] ""
+          `shouldRespondWith`
+          [json| 1 |]
+          { matchStatus = 200 }

test/spec/fixtures/schema.sql

@@ -3800,3 +3800,18 @@ create table factory_buildings (
   factory_id int references factories(id),
   inspections jsonb
 );
+
+-- collision test as occured in https://github.com/PostgREST/postgrest/issues/4052
+create table test.collision_test_table (id integer);
+comment on table collision_test_table is 'foobarbaz';
+
+create function test.collision_test_func(id integer)
+returns int language sql as $$
+  select 1;
+$$;
+
+update pg_proc
+set oid = 'test.collision_test_table'::regclass::oid
+where oid = 'test.collision_test_func'::regproc::oid;
+
+comment on function test.collision_test_func(id integer) is 'fizzbuzz';