Fas 2 steg 1: Inventory Trust Engine - trust states pa inventory_items

packages/inventory-engine/test/trust.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+import { computeTrust, worstTrustState } from "../src/trust.js";
+
+describe("computeTrust", () => {
+  it("returns trusted for a fresh high-confidence item even without user verification", () => {
+    const result = computeTrust({
+      confidence: 0.8,
+      verifiedByUser: false,
+      lastVerifiedAt: null,
+      quantity: 2,
+      updatedAt: new Date(),
+    });
+    expect(result.state).toBe("trusted");
+    expect(result.score).toBeGreaterThanOrEqual(60);
+  });
+
+  it("decays when last verification is old", () => {
+    const thirtyDaysAgo = new Date(Date.now() - 30 * 86_400_000);
+    const result = computeTrust({
+      confidence: 0.6,
+      verifiedByUser: true,
+      lastVerifiedAt: thirtyDaysAgo,
+      quantity: 1,
+      updatedAt: thirtyDaysAgo,
+    });
+    expect(result.state).toBe("decaying");
+  });
+
+  it("is stale for very old unverified low-confidence items", () => {
+    const sixtyDaysAgo = new Date(Date.now() - 60 * 86_400_000);
+    const result = computeTrust({
+      confidence: 0.2,
+      verifiedByUser: false,
+      lastVerifiedAt: null,
+      quantity: 1,
+      updatedAt: sixtyDaysAgo,
+    });
+    expect(result.state).toBe("stale");
+  });
+
+  it("is trusted when user verified recently", () => {
+    const result = computeTrust({
+      confidence: 0.7,
+      verifiedByUser: true,
+      lastVerifiedAt: new Date(),
+      quantity: 1,
+      updatedAt: new Date(),
+    });
+    expect(result.state).toBe("trusted");
+    expect(result.score).toBeGreaterThanOrEqual(70);
+  });
+});
+
+describe("worstTrustState", () => {
+  it("returns stale if present", () => {
+    expect(worstTrustState(["trusted", "stale", "decaying"])).toBe("stale");
+  });
+
+  it("falls back to unverified", () => {
+    expect(worstTrustState(["trusted", "unverified"])).toBe("unverified");
+  });
+});