Initial commit of n8n MCP Server

A Model Context Protocol (MCP) server that integrates with n8n, providing tools for workflow and execution management via the n8n API.

tests/test-setup.ts

@@ -0,0 +1,33 @@
+/**
+ * Global test setup for n8n MCP Server tests
+ */
+import { beforeEach, afterEach, jest } from '@jest/globals';
+
+// Reset environment variables before each test
+beforeEach(() => {
+  process.env = { 
+    ...process.env,
+    NODE_ENV: 'test' 
+  };
+});
+
+// Clean up after each test
+afterEach(() => {
+  jest.resetAllMocks();
+  jest.clearAllMocks();
+});
+
+export const mockEnv = (envVars: Record<string, string>) => {
+  const originalEnv = process.env;
+  
+  beforeEach(() => {
+    process.env = { 
+      ...originalEnv,
+      ...envVars 
+    };
+  });
+  
+  afterEach(() => {
+    process.env = originalEnv;
+  });
+};