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diff --git a/contrib/pgstattuple/sql/pgstattuple.sql b/contrib/pgstattuple/sql/pgstattuple.sql
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+CREATE EXTENSION pgstattuple;
+
+--
+-- It's difficult to come up with platform-independent test cases for
+-- the pgstattuple functions, but the results for empty tables and
+-- indexes should be that.
+--
+
+create table test (a int primary key, b int[]);
+
+select * from pgstattuple('test');
+select * from pgstattuple('test'::text);
+select * from pgstattuple('test'::name);
+select * from pgstattuple('test'::regclass);
+select pgstattuple(oid) from pg_class where relname = 'test';
+select pgstattuple(relname) from pg_class where relname = 'test';
+
+select version, tree_level,
+    index_size / current_setting('block_size')::int as index_size,
+    root_block_no, internal_pages, leaf_pages, empty_pages, deleted_pages,
+    avg_leaf_density, leaf_fragmentation
+    from pgstatindex('test_pkey');
+select version, tree_level,
+    index_size / current_setting('block_size')::int as index_size,
+    root_block_no, internal_pages, leaf_pages, empty_pages, deleted_pages,
+    avg_leaf_density, leaf_fragmentation
+    from pgstatindex('test_pkey'::text);
+select version, tree_level,
+    index_size / current_setting('block_size')::int as index_size,
+    root_block_no, internal_pages, leaf_pages, empty_pages, deleted_pages,
+    avg_leaf_density, leaf_fragmentation
+    from pgstatindex('test_pkey'::name);
+select version, tree_level,
+    index_size / current_setting('block_size')::int as index_size,
+    root_block_no, internal_pages, leaf_pages, empty_pages, deleted_pages,
+    avg_leaf_density, leaf_fragmentation
+    from pgstatindex('test_pkey'::regclass);
+
+select pg_relpages('test');
+select pg_relpages('test_pkey');
+select pg_relpages('test_pkey'::text);
+select pg_relpages('test_pkey'::name);
+select pg_relpages('test_pkey'::regclass);
+select pg_relpages(oid) from pg_class where relname = 'test_pkey';
+select pg_relpages(relname) from pg_class where relname = 'test_pkey';
+
+create index test_ginidx on test using gin (b);
+
+select * from pgstatginindex('test_ginidx');
+
+create index test_hashidx on test using hash (b);
+
+select * from pgstathashindex('test_hashidx');
+
+-- these should error with the wrong type
+select pgstatginindex('test_pkey');
+select pgstathashindex('test_pkey');
+
+select pgstatindex('test_ginidx');
+select pgstathashindex('test_ginidx');
+
+select pgstatindex('test_hashidx');
+select pgstatginindex('test_hashidx');
+
+-- check that using any of these functions with unsupported relations will fail
+create table test_partitioned (a int) partition by range (a);
+create index test_partitioned_index on test_partitioned(a);
+create index test_partitioned_hash_index on test_partitioned using hash(a);
+-- these should all fail
+select pgstattuple('test_partitioned');
+select pgstattuple('test_partitioned_index');
+select pgstattuple_approx('test_partitioned');
+select pg_relpages('test_partitioned');
+select pgstatindex('test_partitioned');
+select pgstatginindex('test_partitioned');
+select pgstathashindex('test_partitioned');
+select pgstathashindex('test_partitioned_hash_index');
+
+create view test_view as select 1;
+-- these should all fail
+select pgstattuple('test_view');
+select pgstattuple_approx('test_view');
+select pg_relpages('test_view');
+select pgstatindex('test_view');
+select pgstatginindex('test_view');
+select pgstathashindex('test_view');
+
+create foreign data wrapper dummy;
+create server dummy_server foreign data wrapper dummy;
+create foreign table test_foreign_table () server dummy_server;
+-- these should all fail
+select pgstattuple('test_foreign_table');
+select pgstattuple_approx('test_foreign_table');
+select pg_relpages('test_foreign_table');
+select pgstatindex('test_foreign_table');
+select pgstatginindex('test_foreign_table');
+select pgstathashindex('test_foreign_table');
+
+-- a partition of a partitioned table should work though
+create table test_partition partition of test_partitioned for values from (1) to (100);
+select pgstattuple('test_partition');
+select pgstattuple_approx('test_partition');
+select pg_relpages('test_partition');
+
+-- toast tables should work
+select pgstattuple((select reltoastrelid from pg_class where relname = 'test'));
+select pgstattuple_approx((select reltoastrelid from pg_class where relname = 'test'));
+select pg_relpages((select reltoastrelid from pg_class where relname = 'test'));
+
+-- not for the index calls though, of course
+select pgstatindex('test_partition');
+select pgstatginindex('test_partition');
+select pgstathashindex('test_partition');
+
+-- an actual index of a partitioned table should work though
+create index test_partition_idx on test_partition(a);
+create index test_partition_hash_idx on test_partition using hash (a);
+-- these should work
+select pgstatindex('test_partition_idx');
+select pgstathashindex('test_partition_hash_idx');
+
+drop table test_partitioned;
+drop view test_view;
+drop foreign table test_foreign_table;
+drop server dummy_server;
+drop foreign data wrapper dummy;