test: add pytest infra and device-dump fixtures

requirements-dev.txt

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+pytest>=8.0

tests/conftest.py

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+import json
+from pathlib import Path
+
+import pytest
+
+DUMPS = Path(__file__).resolve().parent.parent / 'local-tools' / 'dumps'
+
+
+def _load_resources(ip: str) -> dict[str, dict]:
+    data = json.loads((DUMPS / f'{ip}.json').read_text())
+    # Filter to only dict values (skip non-dict representations like "<timeout>")
+    return {k: v for k, v in data['resources'].items() if isinstance(v, dict)}
+
+
+@pytest.fixture
+def dishwasher_resources() -> dict[str, dict]:
+    return _load_resources('10.0.0.129')
+
+
+@pytest.fixture
+def fridge_resources() -> dict[str, dict]:
+    return _load_resources('10.0.0.254')

tests/test_fixtures.py

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+def test_dishwasher_resources_carry_rt(dishwasher_resources):
+    assert dishwasher_resources, "no resources loaded"
+    # Every rep must expose its resource type so discovery can key on it.
+    missing = [h for h, rep in dishwasher_resources.items()
+               if not rep.get('rt')]
+    assert not missing, f"resources without rt: {missing}"
+
+
+def test_fridge_has_autofill(fridge_resources):
+    assert '/autofill/vs/0' in fridge_resources
+    assert 'x.com.samsung.da.autofill' in fridge_resources['/autofill/vs/0']['rt']