Add generic test for exposure schema validation

macros/edr/tests/test_exposure_schema_validity.sql

@@ -0,0 +1,42 @@
+{% test exposure_schema_validity(model) %}
+  {% if execute %}
+    {% set exposures = [] -%}
+    {% for exposure in graph.exposures.values() -%}
+        {%- if model['unique_id'] in exposure.depends_on.nodes -%}
+            {%- if exposure['meta'] is not none -%}
+                {%- do exposures.append(exposure) -%}
+            {%- endif -%}
+        {%- endif -%}
+    {%- endfor %}
+    {%- if exposures.length > 0 -%}
+        {% set model_relation = elementary.get_model_relation_for_test(model, context["model"]) %}
+        {%- set full_table_name = elementary.relation_to_full_name(model_relation) %}
+        {{- elementary.test_log('start', full_table_name, 'exposure validation') }}
+        {%- set columns_from_model = adapter.get_columns_in_relation(model) -%}
+        {%- set columns_dict = dict() -%}
+        {%- for column in columns -%}
+            {%- do column_dtypes.update({ column['name']: elementary.normalize_data_type(column['dtype']) }) -%}
+        {%- endfor -%}
+        {%- set invalid_exposures = [] -%}
+        {%- for exposure in exposures  -%}
+            {# Depend on meta since column level info is not available on exposures #}
+            {%- set meta = fromjson(exposure['meta'], '') -%}
+            {%- if meta != '' -%}
+                {%- for column in meta.getattr('columns', []) -%}
+                    {%- if column['name'] not in columns_dict.keys() -%}
+                        {%- do invalid_exposures.append('Exposure: ' ~ exposure.name ~ ' at ' ~ exposure.url ~ " has a column that's missing in the model: " ~ column['name']) -%}
+                    {%- elif elementary.normalize_data_type(column.getattr('dtype', '')) != elementary.normalize_data_type(column_dtypes[column['name']]) -%}
+                        {%- do invalid_exposures.append('Exposure: ' ~ exposure.name ~ ' at ' ~ exposure.url ~ " has a different data type for the column '" ~ " column '" ~ column['name'] ~ "': '" ~ column['dtype'] ~ "' vs '" ~ column_dtypes ~ "'" -%}
+                    {%- endif -%}
+                {%- endfor -%}
+            {%- endif -%}
+        {%- endfor %}
+        {%- if invalid_exposures.length > 0 -%}
+            {{- return(invalid_exposures) }}
+        {%- else -%}
+            {{- elementary.no_results_query() }}
+        {%- endif -%}
+        {{- elementary.test_log('end', full_table_name, 'exposure validation') }}
+      {% endif %}
+  {% endif %}
+{% endtest %}