Remove duplicated unique test (#108)

* Remove duplicated unique test

* Use unique_combination_of_columns instead

Author: jtcohen6

models/page_views/schema.yml

@@ -13,10 +13,6 @@ models:
             tests:
                 - not_null
 
-          - name: domain_sessionid
-            tests:
-                - not_null
-                        
           - name: domain_sessionid
             tests:
                 - not_null
@@ -54,8 +50,10 @@ models:
 
     - name: snowplow_web_page_context
       tests:
-          - unique:
-              column_name: "concat(page_view_id, root_id)"
+        - dbt_utils.unique_combination_of_columns:
+            combination_of_columns:
+              - page_view_id
+              - root_id
 
       columns:
           - name: page_view_id