Add test case for multiple dbt snapshots in one file

Author: crericha

tests/fixtures/dbt/sushi_test/snapshots/items_check_snapshot.sql

@@ -14,3 +14,19 @@
 select * from {{ source('streaming', 'items') }}
 
 {% endsnapshot %}
+
+{% snapshot items_check_snapshot %}
+
+{{
+    config(
+      target_schema='snapshots',
+      unique_key='id',
+      strategy='check',
+      check_cols=['ds'],
+      invalidate_hard_deletes=True,
+    )
+}}
+
+select * from {{ source('streaming', 'items') }}
+
+{% endsnapshot %}