TST: refactor configuration test

CHANGELOG.md

@@ -9,6 +9,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added ###
 
+* function `_read_config_files` to read `pycaosdb.ini` files from different paths.
+
+### Changed ###
+
+### Deprecated ###
+
+### Removed ###
+
+### Fixed ###
+- #45 test_config_ini_via_envvar
+
+### Security ###
+
+## [Unreleased] ##
+
+### Added ###
+
 * `etag` property for the `caosdb.Query` class. The etag allows to debug the
   caching and to decide whether the server has changed between queries.