Initial import NDC_1C

llm_normalizer/backend/tests/sessionBackwardCompat.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import { AssistantSessionStore } from "../src/services/assistantSessionStore";
+
+describe("assistant session backward compatibility", () => {
+  it("lazy-upgrades legacy session objects without investigation_state", () => {
+    const store = new AssistantSessionStore();
+    const sessionsMap = (store as unknown as { sessions: Map<string, unknown> }).sessions;
+    const sessionId = "legacy-session-1";
+
+    sessionsMap.set(sessionId, {
+      session_id: sessionId,
+      updated_at: "2026-03-25T10:00:00.000Z",
+      items: []
+    });
+
+    const session = store.getSession(sessionId);
+    expect(session).toBeTruthy();
+    expect(session?.session_id).toBe(sessionId);
+    expect(Array.isArray(session?.items)).toBe(true);
+    expect(session?.investigation_state?.schema_version).toBe("investigation_state_v1");
+  });
+
+  it("normalizes malformed legacy sessions with missing items array", () => {
+    const store = new AssistantSessionStore();
+    const sessionsMap = (store as unknown as { sessions: Map<string, unknown> }).sessions;
+    const sessionId = "legacy-session-2";
+
+    sessionsMap.set(sessionId, {
+      session_id: sessionId
+    });
+
+    const ensured = store.ensureSession(sessionId);
+    expect(ensured.session_id).toBe(sessionId);
+    expect(Array.isArray(ensured.items)).toBe(true);
+    expect(ensured.items.length).toBe(0);
+    expect(ensured.investigation_state?.schema_version).toBe("investigation_state_v1");
+  });
+});