Added more test setup stuff

CHANGELOG.md

@@ -6,6 +6,9 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+* [PR-417](https://github.com/itk-dev/hoeringsportal/pull/417)
+  Added more test setup stuff
+
 ## [4.5.1] - 2024-09-06
 
 * [PR-416](https://github.com/itk-dev/hoeringsportal/pull/416)

web/modules/custom/hoeringsportal_deskpro/README.md

@@ -18,6 +18,19 @@ not call an actual Deskpro API. Enable test mode in `settings.local.php`:
 $settings['hoeringsportal_deskpro']['test_mode'] = TRUE;
 ```
 
+and inject a little Deskpro configuration (cf. `/admin/site-setup/deskpro`):
+
+``` shell name=deskpro-test-setup
+docker compose exec phpfpm vendor/bin/drush sql:query "INSERT INTO key_value(collection, name, value) VALUES ('hoeringsportal_deskpro.config', 'deskpro_available_department_ids', '[1]') ON DUPLICATE KEY UPDATE value = '[1]'\G"
+# Check that setting is as expected.
+docker compose exec phpfpm vendor/bin/drush sql:query "SELECT * FROM key_value WHERE collection = 'hoeringsportal_deskpro.config' AND name = 'deskpro_available_department_ids'\G"
+```
+
+When in test mode, the Deskpro service will return data defined in [YAML
+files](https://en.wikipedia.org/wiki/YAML) in the
+[`src/Service/mock`](src/Service/mock) folder. (The `1` in the SQL incantations
+above match `id: 1` in `src/Service/mock/ticket_departments.yaml`).
+
 ## Drush commands
 
 ```sh