fix: Mock fs module in tests to prevent certificate directory creation (v0.9.0a)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "obsidian-mcp-plugin",
-  "version": "0.9.0",
+  "version": "0.9.0a",
   "description": "Semantic MCP server plugin providing AI tools with direct Obsidian vault access via HTTP transport",
   "main": "main.js",
   "scripts": {

tests/mcp-server.test.ts

@@ -1,6 +1,14 @@
 import { MCPHttpServer } from '../src/mcp-server';
 import { App } from 'obsidian';
 
+// Mock the fs module to prevent file system operations in tests
+jest.mock('fs', () => ({
+  existsSync: jest.fn(() => false),
+  mkdirSync: jest.fn(),
+  readFileSync: jest.fn(),
+  writeFileSync: jest.fn()
+}));
+
 describe('MCPHttpServer', () => {
   let mockApp: App;