DBT structure change

tests/generic/test_is_positive.sql

@@ -0,0 +1,26 @@
+{% test is_positive(model, column_name) %}
+
+with validation as (
+
+    select
+        {{ column_name }} as value_field
+
+    from {{ model }}
+
+),
+
+validation_errors as (
+
+    select
+        value_field
+
+    from validation
+
+    where  value_field   < 0
+
+)
+
+select *
+from validation_errors
+
+{% endtest %}