Add unit tests for device registry model parsing

- Introduced a new test file `test_models.py` to implement unit tests for various device models in the `device_registry`.
- Added parameterized tests to validate the parsing of device configurations against expected JSON outputs and to ensure required sections are present in the parsed models.
- Enhanced test coverage for multiple device types including Mikrotik, Keenetic, Qtech, Huawei, Eltex, and Quasar.

tests/test_models.py

@@ -0,0 +1,38 @@
+import json
+
+import pytest
+
+from conftest import FIXTURES, load
+from oxi.interfaces import device_registry
+
+MODEL_CASES = [
+    ("mikrotik", "config.conf", "config.expected.json"),
+    ("keenetic", "config.conf", "config.expected.json"),
+    ("qtech", "config_1.conf", "config_1.expected.json"),
+    ("qtech", "config_2.conf", "config_2.expected.json"),
+    ("huawei", "config.conf", "config.expected.json"),
+    ("eltex", "config.conf", "config.expected.json"),
+    ("quasar", "config_1.conf", "config_1.expected.json"),
+    ("quasar", "config_2.conf", "config_2.expected.json"),
+]
+
+
+@pytest.mark.parametrize("model_key, fixture, expected_file", MODEL_CASES)
+def test_parse_matches_golden(model_key, fixture, expected_file):
+    cls = device_registry[model_key]
+    raw = load(model_key, fixture)
+
+    parsed = cls(raw).parse().model_dump(by_alias=True, mode="json")
+
+    expected = json.loads((FIXTURES / model_key / expected_file).read_text("utf-8"))
+    assert parsed == expected
+
+
+@pytest.mark.parametrize("model_key, fixture, _expected", MODEL_CASES)
+def test_parse_has_required_sections(model_key, fixture, _expected):
+    cls = device_registry[model_key]
+    device = cls(load(model_key, fixture)).parse()
+
+    assert device.system is not None
+    assert isinstance(device.interfaces, list)
+    assert isinstance(device.vlans, list)