add e2e tests

Author: betegon

dev-packages/e2e-tests/test-applications/node-express-v5/tests/mcp.test.ts

@@ -11,8 +11,20 @@ test('Should record transactions for mcp handlers', async ({ baseURL }) => {
     version: '1.0.0',
   });
 
+  const initializeTransactionPromise = waitForTransaction('node-express-v5', transactionEvent => {
+    return transactionEvent.transaction === 'initialize';
+  });
+
   await client.connect(transport);
 
+  await test.step('initialize handshake', async () => {
+    const initializeTransaction = await initializeTransactionPromise;
+    expect(initializeTransaction).toBeDefined();
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.method.name']).toEqual('initialize');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.client.name']).toEqual('test-client');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.server.name']).toEqual('Echo');
+  });
+
   await test.step('tool handler', async () => {
     const postTransactionPromise = waitForTransaction('node-express-v5', transactionEvent => {
       return transactionEvent.transaction === 'POST /messages';

dev-packages/e2e-tests/test-applications/node-express/tests/mcp.test.ts

@@ -11,8 +11,21 @@ test('Should record transactions for mcp handlers', async ({ baseURL }) => {
     version: '1.0.0',
   });
 
+  const initializeTransactionPromise = waitForTransaction('node-express', transactionEvent => {
+    return transactionEvent.transaction === 'initialize';
+  });
+
   await client.connect(transport);
 
+  await test.step('initialize handshake', async () => {
+    const initializeTransaction = await initializeTransactionPromise;
+    expect(initializeTransaction).toBeDefined();
+    expect(initializeTransaction.contexts?.trace?.op).toEqual('mcp.server');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.method.name']).toEqual('initialize');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.client.name']).toEqual('test-client');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.server.name']).toEqual('Echo');
+  });
+
   await test.step('tool handler', async () => {
     const postTransactionPromise = waitForTransaction('node-express', transactionEvent => {
       return transactionEvent.transaction === 'POST /messages';

dev-packages/e2e-tests/test-applications/tsx-express/tests/mcp.test.ts

@@ -11,8 +11,21 @@ test('Records transactions for mcp handlers', async ({ baseURL }) => {
     version: '1.0.0',
   });
 
+  const initializeTransactionPromise = waitForTransaction('tsx-express', transactionEvent => {
+    return transactionEvent.transaction === 'initialize';
+  });
+
   await client.connect(transport);
 
+  await test.step('initialize handshake', async () => {
+    const initializeTransaction = await initializeTransactionPromise;
+    expect(initializeTransaction).toBeDefined();
+    expect(initializeTransaction.contexts?.trace?.op).toEqual('mcp.server');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.method.name']).toEqual('initialize');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.client.name']).toEqual('test-client');
+    expect(initializeTransaction.contexts?.trace?.data?.['mcp.server.name']).toEqual('Echo');
+  });
+
   await test.step('tool handler', async () => {
     const postTransactionPromise = waitForTransaction('tsx-express', transactionEvent => {
       return transactionEvent.transaction === 'POST /messages';