test: implement tests

tests/unit/panelStorage.minimal.test.ts

@@ -0,0 +1,19 @@
+// Use global test functions with globals enabled in config
+
+import { PanelStorage } from "$lib/utils/panelStorage";
+
+let storage: any;
+
+beforeEach(() => {
+  storage = new PanelStorage();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("PanelStorage", () => {
+  it("should create storage instance", () => {
+    expect(storage).toBeInstanceOf(PanelStorage);
+  });
+});