feat: add ImportService protocol and registry for OCP-compliant import extensibility (LP-7)

backend/tests/test_import_service_protocol.py

@@ -0,0 +1,49 @@
+"""Tests for the ImportService protocol and IMPORT_REGISTRY."""
+
+from app.domain.ports.import_service import (
+    IMPORT_REGISTRY,
+    ImportService,
+    ImportServiceEntry,
+    get_import_handler,
+)
+
+
+def test_registry_has_all_known_sources():
+    expected = {
+        "atomic_red_team",
+        "sigma",
+        "lolbas",
+        "gtfobins",
+        "caldera",
+        "elastic_rules",
+        "mitre_cti",
+        "d3fend",
+    }
+    assert set(IMPORT_REGISTRY.keys()) == expected
+
+
+def test_all_entries_are_import_service_entries():
+    for name, entry in IMPORT_REGISTRY.items():
+        assert isinstance(entry, ImportServiceEntry), f"{name} is not ImportServiceEntry"
+
+
+def test_get_import_handler_returns_entry_for_known_source():
+    handler = get_import_handler("sigma")
+    assert handler is not None
+    assert isinstance(handler, ImportServiceEntry)
+
+
+def test_get_import_handler_returns_none_for_unknown():
+    assert get_import_handler("nonexistent_source") is None
+
+
+def test_import_service_entry_source_info():
+    entry = ImportServiceEntry("app.services.sigma_import_service", "sync")
+    assert entry.source_info == "app.services.sigma_import_service.sync"
+
+
+def test_callable_satisfies_protocol():
+    def mock_handler(db):
+        return {"created": 0}
+
+    assert isinstance(mock_handler, ImportService)