- Introduced a new utility function `expand_vlan_range` in `utils.py` to expand VLAN range strings into individual VLAN IDs.
- Created a new test file `test_units.py` with unit tests for the `expand_vlan_range` function, covering various scenarios including simple ranges, reversed ranges, non-numeric inputs, and list inputs.
- Enhanced test coverage for other functionalities in the `device_registry` and template validation classes.
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