test: implement initial testing framework

.gitignore

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+# compiled code & logs
+**/target/
+**/logs/
+# package folder
+**/dbt_packages/
+# dbt folders that are not used
+**/snapshots/
+**/analysis/
+**/data/
+# user specific file
+**/.user.yml
+
+# MacOS specific files
+.DS_Store

integration_tests/dbt_project.yml

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+name: 'pm_utils_integration_tests'
+version: '1.0.0'
+config-version: 2
+
+profile: 'integration_tests'

integration_tests/macros/tests.sql

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+{% test equal_value(model, actual, expected) %}
+    select * from {{ model }} where {{ actual }} != {{ expected }}
+{% endtest %}

integration_tests/models/schema.yml

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+version: 2
+
+models:
+  - name: test_concat
+    tests:
+      - equal_value:
+          actual: '"Two_text_fields"'
+          expected: '"Two_text_fields_expected"'
+      - equal_value:
+          actual: '"One_null"'
+          expected: '"One_null_expected"'

integration_tests/models/test_concat.sql

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+with Input_data as (
+    select
+        'A' as "Column_A",
+        'B' as "Column_B",
+        null as "Column_C"
+)
+
+select
+    {# Concatenate two text fields (basic scenario) #}
+    {{ pm_utils.concat('"Column_A"', '"Column_B"') }} as "Two_text_fields",
+    'AB' as "Two_text_fields_expected",
+
+    {# Concatenate two fields of which one is null #}
+    {{ pm_utils.concat('"Column_A"', '"Column_C"') }} as "One_null",
+    'A' as "One_null_expected"
+from Input_data

integration_tests/packages.yml

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+packages:
+  - local: ../