Add ContactService persistence tests

test/integration/ContactService-e2e-test.ts

@@ -0,0 +1,34 @@
+import "fake-indexeddb/auto";
+
+import { ContactService } from "../../src/libp2p/services/ContactService";
+import { IndexedDBStore } from "../../src/libp2p/storage/IndexedDBStore";
+
+if (typeof global.structuredClone === "undefined") {
+    (global as any).structuredClone = (obj: any) => JSON.parse(JSON.stringify(obj));
+}
+
+describe("ContactService End-to-End", () => {
+    const dbName = "contact-service-e2e";
+
+    beforeEach(() => {
+        indexedDB.deleteDatabase(dbName);
+    });
+
+    it("should persist contacts across app restarts", async () => {
+        const store1 = new IndexedDBStore(dbName);
+        await store1.open();
+        const service1 = new ContactService(store1);
+        await service1.initialize();
+
+        await service1.addContact({ peerId: "peer", nickname: "Alice" });
+        store1.close();
+
+        const store2 = new IndexedDBStore(dbName);
+        await store2.open();
+        const service2 = new ContactService(store2);
+        await service2.initialize();
+
+        expect(service2.getContact("peer")?.nickname).toBe("Alice");
+        store2.close();
+    });
+});

test/unit-tests/ContactService-persistence-test.ts

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+import { ContactService } from "../../src/libp2p/services/ContactService";
+import type { Contact } from "../../src/libp2p/types";
+
+class MockIndexedDBStore {
+    public putContact = jest.fn();
+    public getAllContacts = jest.fn<Promise<Contact[]>, []>(() => Promise.resolve([]));
+    public deleteContact = jest.fn();
+}
+
+describe("ContactService Persistence", () => {
+    it("should persist contacts to IndexedDB on add", async () => {
+        const store = new MockIndexedDBStore();
+        const service = new ContactService(store as any);
+
+        await service.initialize();
+        await service.addContact({ peerId: "test", nickname: "Test" });
+
+        expect(store.putContact).toHaveBeenCalled();
+    });
+
+    it("should restore contacts from IndexedDB on initialize", async () => {
+        const stored: Contact = { peerId: "peer", nickname: "Alice", created: 1, lastSeen: 1 };
+        const store = new MockIndexedDBStore();
+        store.getAllContacts = jest.fn().mockResolvedValue([stored]);
+
+        const service = new ContactService(store as any);
+        await service.initialize();
+
+        expect(service.getContact("peer")).toEqual(stored);
+    });
+});