Add test suite, cover existing functions

test/utils.ts

@@ -0,0 +1,16 @@
+import { vi } from 'vitest';
+
+export class MockPrivateClient {
+  storeObject = vi.fn();
+  remove = vi.fn();
+  getObject = vi.fn();
+  getAll = vi.fn();
+  getListing = vi.fn();
+  declareType = vi.fn();
+
+  // Helper to verify calls easily if needed directly
+}
+
+export function createMockClient() {
+  return new MockPrivateClient();
+}