s&p update models

macros/tests/at_least_one_null.sql

@@ -0,0 +1,10 @@
+{% test at_least_one_null(model, columns) %}
+
+    select *
+    from {{ model }}
+    where
+        {% for column in columns %}
+            {{ column }} is not null {% if not loop.last %} and {% endif %}
+        {% endfor %}
+-- If all columns are not null, the row violates the test
+{% endtest %}

macros/tests/is_first_day_of_month.sql

@@ -0,0 +1,3 @@
+{% test is_first_day_of_month(model, column_name) %}
+    select * from {{ model }} where extract(day from {{ column_name }}) != 1
+{% endtest %}

macros/tests/is_last_day_of_month.sql

@@ -0,0 +1,9 @@
+{% test is_last_day_of_month(model, column_name) %}
+    select *
+    from {{ model }}
+    where
+        {{ column_name }}
+        != date_trunc('MONTH', {{ column_name }})
+        + interval '1 MONTH'
+        - interval '1 DAY'
+{% endtest %}