MAESTRO: add engine TDD fixtures and tests

backend/tests/engine/test_scanner_registry.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from app.engine.scanner_registry import ScannerRegistry
+
+
+def test_registry_discovers_all_scanners() -> None:
+    registry = ScannerRegistry()
+    scanners = registry.get_all()
+
+    assert len(scanners) >= 106
+
+    ids = [scanner.id for scanner in scanners]
+    assert len(ids) == len(set(ids))
+    assert {1, 12, 66}.issubset(set(ids))
+
+
+def test_registry_filters_by_ids_and_lists_tests() -> None:
+    registry = ScannerRegistry()
+    selected = registry.get_by_ids([1, 12, 66])
+
+    assert [scanner.id for scanner in selected] == [1, 12, 66]
+
+    tests = registry.list_tests()
+    lookup = {test.id: test for test in tests}
+
+    assert lookup[1].name == "Received - Mail Servers Flow"
+    assert lookup[12].name == "X-Forefront-Antispam-Report"
+    assert lookup[66].name == "X-Proofpoint-Spam-Details"
+
+    assert lookup[1].category
+    assert lookup[12].category
+    assert lookup[66].category