Refactor Qtech model to utilize centralized VLAN range expansion utility

- Replaced the internal `_expand_vlan_range` function in the `Qtech` class with the new `expand_vlan_range` utility from `utils.py` for improved code maintainability.
- Added new configuration files `config_1.conf` and `config_2.conf` for Qtech devices to facilitate testing.
- Introduced expected output JSON files `config_1.expected.json` and `config_2.expected.json` to validate the parsing of Qtech configurations against expected results.

oxi/interfaces/models/qtech.py

@@ -1,32 +1,6 @@
 from oxi.interfaces import register_parser
 from oxi.interfaces.base import BaseDevice
-
-
-def _expand_vlan_range(value: str | list[str]) -> list[str]:
-    """Expand values like '1,7,14-15' into individual VLAN IDs."""
-    if isinstance(value, list):
-        value = ",".join(str(item) for item in value)
-
-    result: list[str] = []
-    if not value:
-        return result
-    for part in value.split(","):
-        part = part.strip()
-        if not part:
-            continue
-        if "-" in part:
-            start_s, end_s = part.split("-", 1)
-            try:
-                start, end = int(start_s), int(end_s)
-            except ValueError:
-                result.append(part)
-                continue
-            if start > end:
-                start, end = end, start
-            result.extend(str(i) for i in range(start, end + 1))
-        else:
-            result.append(part)
-    return result
+from oxi.interfaces.utils import expand_vlan_range
 
 
 @register_parser(["QTECH"])
@@ -48,21 +22,8 @@ class Qtech(BaseDevice):
             tail = item.get("vlan_tail")
             if tail:
                 ids = [*ids, tail] if isinstance(ids, list) else f"{ids},{tail}"
-            for vid in _expand_vlan_range(ids):
+            for vid in expand_vlan_range(ids):
                 if vid in named_vlan:
                     continue
                 vlans.append({"vlan_id": vid})
         return vlans
-
-
-if __name__ == "__main__":
-    with open("./test3.txt") as file:
-        data = file.read()
-    qtech = Qtech(data)
-    qt = qtech.parse()
-    print(qt)
-    with open("./test3-1.txt") as file:
-        data = file.read()
-    qtech = Qtech(data)
-    qt = qtech.parse()
-    print(qt)