fix(test): round-trip a sample

schema/compat/pg_prometheus.sql

@@ -1,5 +1,5 @@
 -- these views are required for the prometheus-sql-adapter schema
--- to be fullly compatible with the pg_prometheus schema
+-- to be fully compatible with the pg_prometheus schema
 
 CREATE VIEW metrics_labels AS
 SELECT

schema/compat/prometheus-sql-adapter.sql

@@ -1,5 +1,5 @@
 -- these views are required for the pg_prometheus schema
--- to be fullly compatible with the prometheus-sql-adapter schema
+-- to be fully compatible with the prometheus-sql-adapter schema
 
 CREATE VIEW metric_labels AS
 SELECT

test/tables/samples.sql

@@ -0,0 +1,37 @@
+BEGIN;
+-- describe samples experiment
+SELECT plan(3);
+
+\set test_uuid '''00000000-0000-0000-0000-000000000000'''
+
+INSERT INTO metric_labels VALUES (:test_uuid, NOW(), '{"__name__":"foo"}');
+INSERT INTO metric_samples VALUES (NOW(), 'foo', (
+  SELECT lid FROM metric_labels LIMIT 1
+), 512.0);
+
+SELECT results_eq(
+  E'SELECT lid, labels->>\'__name__\' FROM metric_labels',
+  $$VALUES
+    ('00000000-0000-0000-0000-000000000000'::uuid, 'foo')
+  $$,
+  'labels should match'
+);
+
+SELECT results_eq(
+  'SELECT lid, name, value FROM metric_samples',
+  $$VALUES
+    ('00000000-0000-0000-0000-000000000000'::uuid, 'foo', 512.0::float)
+  $$,
+  'samples should match'
+);
+
+SELECT results_eq(
+  'SELECT name, value FROM metrics',
+  $$VALUES
+    ('foo', 512.0::float)
+  $$,
+  'metrics should match'
+);
+
+SELECT * FROM finish();
+ROLLBACK;