Adding some simple tests. (#54)

packages/server/src/index.test.ts

@@ -0,0 +1,9 @@
+import { describe, it, expect } from 'vitest';
+import { helloServer } from './index.js';
+
+describe('server tests', () => {
+  it('should export helloServer function', () => {
+    expect(helloServer).toBeDefined();
+    expect(typeof helloServer).toBe('function');
+  });
+});