feat(domain): add domain layer foundation -- enums, value objects, TechniqueEntity, repository ports

backend/tests/test_value_objects.py

@@ -0,0 +1,114 @@
+"""Tests for domain value objects: MitreId and ScoringWeights."""
+
+import sys
+import os
+
+backend_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+if backend_dir not in sys.path:
+    sys.path.insert(0, backend_dir)
+
+import pytest
+
+from app.domain.value_objects.mitre_id import MitreId
+from app.domain.value_objects.scoring_weights import ScoringWeights
+
+
+# ── MitreId ──────────────────────────────────────────────────────────
+
+
+class TestMitreId:
+
+    def test_valid_technique(self):
+        mid = MitreId("T1059")
+        assert mid.value == "T1059"
+        assert str(mid) == "T1059"
+        assert not mid.is_subtechnique
+        assert mid.parent_id is None
+
+    def test_valid_subtechnique(self):
+        mid = MitreId("T1059.001")
+        assert mid.value == "T1059.001"
+        assert mid.is_subtechnique
+        assert mid.parent_id == "T1059"
+
+    def test_invalid_empty_string(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("")
+
+    def test_invalid_no_prefix(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("1059")
+
+    def test_invalid_wrong_prefix(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("A1059")
+
+    def test_invalid_too_few_digits(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("T105")
+
+    def test_invalid_subtechnique_format(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("T1059.01")  # needs 3 digits after dot
+
+    def test_invalid_trailing_garbage(self):
+        with pytest.raises(ValueError, match="Invalid MITRE"):
+            MitreId("T1059.001.002")
+
+    def test_equality_with_same_mitre_id(self):
+        assert MitreId("T1059") == MitreId("T1059")
+
+    def test_equality_with_string(self):
+        assert MitreId("T1059") == "T1059"
+
+    def test_inequality(self):
+        assert MitreId("T1059") != MitreId("T1060")
+
+    def test_hashable(self):
+        s = {MitreId("T1059"), MitreId("T1059"), MitreId("T1060")}
+        assert len(s) == 2
+
+    def test_immutable(self):
+        mid = MitreId("T1059")
+        with pytest.raises(AttributeError):
+            mid.value = "T1060"
+
+
+# ── ScoringWeights ───────────────────────────────────────────────────
+
+
+class TestScoringWeights:
+
+    def test_valid_default(self):
+        w = ScoringWeights.default()
+        assert w.tests == 40.0
+        assert w.detection_rules == 25.0
+        assert w.d3fend == 15.0
+        assert w.freshness == 10.0
+        assert w.platform_diversity == 10.0
+
+    def test_valid_custom(self):
+        w = ScoringWeights(
+            tests=50, detection_rules=20, d3fend=10,
+            freshness=10, platform_diversity=10,
+        )
+        assert w.tests == 50
+
+    def test_invalid_sum_not_100(self):
+        with pytest.raises(ValueError, match="sum to 100"):
+            ScoringWeights(
+                tests=50, detection_rules=20, d3fend=10,
+                freshness=10, platform_diversity=5,
+            )
+
+    def test_invalid_negative_weight(self):
+        with pytest.raises(ValueError, match="non-negative"):
+            ScoringWeights(
+                tests=-10, detection_rules=40, d3fend=30,
+                freshness=20, platform_diversity=20,
+            )
+
+    def test_immutable(self):
+        w = ScoringWeights.default()
+        with pytest.raises(AttributeError):
+            w.tests = 50