potiuk commented on code in PR #40205:
URL: https://github.com/apache/airflow/pull/40205#discussion_r1639253344
##########
contributing-docs/testing/unit_tests.rst:
##########
@@ -1440,6 +1440,29 @@ to **ignore**, e.g. set ``PYTHONWARNINGS`` environment
variable to ``ignore``.
pytest tests/core/ --disable-capture-warnings
+Keep tests using environment variables
+......................................
+
+By default, all environment variables related to Airflow (starting by
``AIRFLOW__``) are all cleared before running tests
+to avoid potential side effect. However, in some scenarios you might want to
disable this mechanism and keep the
+environment variables you defined to configure your Airflow environment. For
example, you might want to run tests
+against a specific database configured through the environment variable
``AIRFLOW__DATABASE__SQL_ALCHEMY_CONN``.
+Or running tests using a specific executor to run tasks configured through
``AIRFLOW__CORE__EXECUTOR``.
+
+To keep using environment variables you defined in your environment, you need
to provide ``--keep-env-variables`` as
+pytest CLI argument.
+
+.. code-block:: bash
+
+ pytest tests/core/ --disable-capture-warnings
Review Comment:
```suggestion
pytest tests/core/ --keep-env-variables
```
And. below too :)
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