test: add basic diagnostic tests to validate CI environment

dashboard/frontend/tests/test_basic.js

@@ -0,0 +1,21 @@
+"""
+Basic diagnostic tests to validate frontend test environment.
+"""
+import { describe, it, expect } from 'vitest';
+
+describe('Basic Environment Tests', () => {
+  it('should run basic math', () => {
+    expect(1 + 1).toBe(2);
+  });
+
+  it('should have access to DOM APIs', () => {
+    expect(typeof document).toBe('object');
+    expect(typeof window).toBe('object');
+  });
+
+  it('should have localStorage mock', () => {
+    localStorage.setItem('test', 'value');
+    expect(localStorage.getItem('test')).toBe('value');
+    localStorage.removeItem('test');
+  });
+});