It is my assumption that the signal gets only default values for config-values, with does not change at runtime.

If they change at runtime you could either write a method to delete or rewrite the cache, or you could do it manualy. For example:

```python
del config._config_variables
```
In the tests, you do not have to import 'config', but you can also import ConfigHandler and create your own config-object with its own cache.