feat: add testing using vitest

src/__tests__/config.test.ts

@@ -0,0 +1,11 @@
+import { describe, it, expect, vi } from 'vitest';
+import path from 'path';
+import os from 'os';
+import { getConfigPath } from '../config.js';
+
+describe('config', () => {
+  it('should return the correct config path', () => {
+    const expectedPath = path.join(os.homedir(), '.shsf_config');
+    expect(getConfigPath()).toBe(expectedPath);
+  });
+});