test: verify the log in close/navigate test

tests/capabilities.spec.ts

@@ -77,7 +77,7 @@ test('test vision tool list', async ({ visionClient }) => {
 });
 
 test('test capabilities', async ({ startClient }) => {
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--caps="core"'],
   });
   const { tools } = await client.listTools();

tests/cdp.spec.ts

@@ -18,7 +18,7 @@ import { test, expect } from './fixtures.js';
 
 test('cdp server', async ({ cdpServer, startClient, server }) => {
   await cdpServer.start();
-  const client = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
+  const { client } = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
   expect(await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },
@@ -27,7 +27,7 @@ test('cdp server', async ({ cdpServer, startClient, server }) => {
 
 test('cdp server reuse tab', async ({ cdpServer, startClient, server }) => {
   const browserContext = await cdpServer.start();
-  const client = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
+  const { client } = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
 
   const [page] = browserContext.pages();
   await page.goto(server.HELLO_WORLD);
@@ -58,7 +58,7 @@ test('cdp server reuse tab', async ({ cdpServer, startClient, server }) => {
 });
 
 test('should throw connection error and allow re-connecting', async ({ cdpServer, startClient, server }) => {
-  const client = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
+  const { client } = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
 
   server.setContent('/', `
     <title>Title</title>

tests/config.spec.ts

@@ -33,7 +33,7 @@ test('config user data dir', async ({ startClient, server }, testInfo) => {
   const configPath = testInfo.outputPath('config.json');
   await fs.promises.writeFile(configPath, JSON.stringify(config, null, 2));
 
-  const client = await startClient({ args: ['--config', configPath] });
+  const { client } = await startClient({ args: ['--config', configPath] });
   expect(await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.PREFIX },
@@ -54,7 +54,7 @@ test.describe(() => {
     const configPath = testInfo.outputPath('config.json');
     await fs.promises.writeFile(configPath, JSON.stringify(config, null, 2));
 
-    const client = await startClient({ args: ['--config', configPath] });
+    const { client } = await startClient({ args: ['--config', configPath] });
     expect(await client.callTool({
       name: 'browser_navigate',
       arguments: { url: 'data:text/html,<script>document.title = navigator.userAgent</script>' },

tests/device.spec.ts

@@ -17,7 +17,7 @@
 import { test, expect } from './fixtures.js';
 
 test('--device should work', async ({ startClient, server }) => {
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--device', 'iPhone 15'],
   });
 

tests/files.spec.ts

@@ -101,7 +101,7 @@ The tool "browser_file_upload" can only be used when there is related modal stat
 });
 
 test('clicking on download link emits download', async ({ startClient, server }, testInfo) => {
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir: testInfo.outputPath('output') },
   });
 
@@ -125,7 +125,7 @@ test('clicking on download link emits download', async ({ startClient, server },
 });
 
 test('navigating to download link emits download', async ({ startClient, server, mcpBrowser }, testInfo) => {
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir: testInfo.outputPath('output') },
   });
 

tests/fixtures.ts

@@ -40,7 +40,7 @@ type CDPServer = {
 type TestFixtures = {
   client: Client;
   visionClient: Client;
-  startClient: (options?: { clientName?: string, args?: string[], config?: Config }) => Promise<Client>;
+  startClient: (options?: { clientName?: string, args?: string[], config?: Config }) => Promise<{ client: Client, stderr: () => string }>;
   wsEndpoint: string;
   cdpServer: CDPServer;
   server: TestServer;
@@ -55,11 +55,13 @@ type WorkerFixtures = {
 export const test = baseTest.extend<TestFixtures & TestOptions, WorkerFixtures>({
 
   client: async ({ startClient }, use) => {
-    await use(await startClient());
+    const { client } = await startClient();
+    await use(client);
   },
 
   visionClient: async ({ startClient }, use) => {
-    await use(await startClient({ args: ['--vision'] }));
+    const { client } = await startClient({ args: ['--vision'] });
+    await use(client);
   },
 
   startClient: async ({ mcpHeadless, mcpBrowser, mcpMode }, use, testInfo) => {
@@ -85,9 +87,13 @@ export const test = baseTest.extend<TestFixtures & TestOptions, WorkerFixtures>(
 
       client = new Client({ name: options?.clientName ?? 'test', version: '1.0.0' });
       const transport = createTransport(args, mcpMode);
+      let stderr = '';
+      transport.stderr?.on('data', data => {
+        stderr += data.toString();
+      });
       await client.connect(transport);
       await client.ping();
-      return client;
+      return { client, stderr: () => stderr };
     });
 
     await client?.close();
@@ -168,7 +174,13 @@ function createTransport(args: string[], mcpMode: TestOptions['mcpMode']) {
     command: 'node',
     args: [path.join(path.dirname(__filename), '../cli.js'), ...args],
     cwd: path.join(path.dirname(__filename), '..'),
-    env: process.env as Record<string, string>,
+    stderr: 'pipe',
+    env: {
+      ...process.env,
+      DEBUG: 'pw:mcp:test',
+      DEBUG_COLORS: '0',
+      DEBUG_HIDE_DATE: '1',
+    },
   });
 }
 
@@ -225,3 +237,7 @@ export const expect = baseExpect.extend({
     };
   },
 });
+
+export function formatOutput(output: string): string[] {
+  return output.split('\n').map(line => line.replace(/^pw:mcp:test /, '').replace(/test-results.*/, '').trim()).filter(Boolean);
+}

tests/launch.spec.ts

@@ -16,9 +16,10 @@
 
 import fs from 'fs';
 
-import { test, expect } from './fixtures.js';
+import { test, expect, formatOutput } from './fixtures.js';
 
-test('test reopen browser', async ({ client, server }) => {
+test('test reopen browser', async ({ startClient, server }) => {
+  const { client, stderr } = await startClient();
   await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },
@@ -32,10 +33,31 @@ test('test reopen browser', async ({ client, server }) => {
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },
   })).toContainTextContent(`- generic [ref=e1]: Hello, world!`);
+
+  await client.close();
+
+  if (process.platform === 'win32')
+    return;
+
+  await expect.poll(() => formatOutput(stderr()), { timeout: 0 }).toEqual([
+    'create context',
+    'create browser context (persistent)',
+    'lock user data dir',
+    'close context',
+    'close browser context (persistent)',
+    'release user data dir',
+    'close browser context complete (persistent)',
+    'create browser context (persistent)',
+    'lock user data dir',
+    'close context',
+    'close browser context (persistent)',
+    'release user data dir',
+    'close browser context complete (persistent)',
+  ]);
 });
 
 test('executable path', async ({ startClient, server }) => {
-  const client = await startClient({ args: [`--executable-path=bogus`] });
+  const { client } = await startClient({ args: [`--executable-path=bogus`] });
   const response = await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },
@@ -53,7 +75,7 @@ test('persistent context', async ({ startClient, server }) => {
     </script>
   `, 'text/html');
 
-  const client = await startClient();
+  const { client } = await startClient();
   const response = await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.PREFIX },
@@ -66,7 +88,7 @@ test('persistent context', async ({ startClient, server }) => {
     name: 'browser_close',
   });
 
-  const client2 = await startClient();
+  const { client: client2 } = await startClient();
   const response2 = await client2.callTool({
     name: 'browser_navigate',
     arguments: { url: server.PREFIX },
@@ -85,18 +107,18 @@ test('isolated context', async ({ startClient, server }) => {
     </script>
   `, 'text/html');
 
-  const client = await startClient({ args: [`--isolated`] });
-  const response = await client.callTool({
+  const { client: client1 } = await startClient({ args: [`--isolated`] });
+  const response = await client1.callTool({
     name: 'browser_navigate',
     arguments: { url: server.PREFIX },
   });
   expect(response).toContainTextContent(`Storage: NO`);
 
-  await client.callTool({
+  await client1.callTool({
     name: 'browser_close',
   });
 
-  const client2 = await startClient({ args: [`--isolated`] });
+  const { client: client2 } = await startClient({ args: [`--isolated`] });
   const response2 = await client2.callTool({
     name: 'browser_navigate',
     arguments: { url: server.PREFIX },
@@ -123,7 +145,7 @@ test('isolated context with storage state', async ({ startClient, server }, test
     </script>
   `, 'text/html');
 
-  const client = await startClient({ args: [
+  const { client } = await startClient({ args: [
     `--isolated`,
     `--storage-state=${storageStatePath}`,
   ] });

tests/pdf.spec.ts

@@ -19,7 +19,7 @@ import fs from 'fs';
 import { test, expect } from './fixtures.js';
 
 test('save as pdf unavailable', async ({ startClient, server }) => {
-  const client = await startClient({ args: ['--caps="no-pdf"'] });
+  const { client } = await startClient({ args: ['--caps="no-pdf"'] });
   await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },
@@ -31,7 +31,7 @@ test('save as pdf unavailable', async ({ startClient, server }) => {
 });
 
 test('save as pdf', async ({ startClient, mcpBrowser, server }, testInfo) => {
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir: testInfo.outputPath('output') },
   });
 
@@ -51,7 +51,7 @@ test('save as pdf', async ({ startClient, mcpBrowser, server }, testInfo) => {
 test('save as pdf (filename: output.pdf)', async ({ startClient, mcpBrowser, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
   test.skip(!!mcpBrowser && !['chromium', 'chrome', 'msedge'].includes(mcpBrowser), 'Save as PDF is only supported in Chromium.');
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir },
   });
 

tests/request-blocking.spec.ts

@@ -37,7 +37,7 @@ test('default to allow all', async ({ server, client }) => {
 });
 
 test('blocked works', async ({ startClient }) => {
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--blocked-origins', 'microsoft.com;example.com;playwright.dev']
   });
   const result = await fetchPage(client, 'https://example.com/');
@@ -46,15 +46,15 @@ test('blocked works', async ({ startClient }) => {
 
 test('allowed works', async ({ server, startClient }) => {
   server.setContent('/ppp', 'content:PPP', 'text/html');
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--allowed-origins', `microsoft.com;${new URL(server.PREFIX).host};playwright.dev`]
   });
   const result = await fetchPage(client, server.PREFIX + 'ppp');
   expect(result).toContain('content:PPP');
 });
 
 test('blocked takes precedence', async ({ startClient }) => {
-  const client = await startClient({
+  const { client } = await startClient({
     args: [
       '--blocked-origins', 'example.com',
       '--allowed-origins', 'example.com',
@@ -65,7 +65,7 @@ test('blocked takes precedence', async ({ startClient }) => {
 });
 
 test('allowed without blocked blocks all non-explicitly specified origins', async ({ startClient }) => {
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--allowed-origins', 'playwright.dev'],
   });
   const result = await fetchPage(client, 'https://example.com/');
@@ -74,7 +74,7 @@ test('allowed without blocked blocks all non-explicitly specified origins', asyn
 
 test('blocked without allowed allows non-explicitly specified origins', async ({ server, startClient }) => {
   server.setContent('/ppp', 'content:PPP', 'text/html');
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--blocked-origins', 'example.com'],
   });
   const result = await fetchPage(client, server.PREFIX + 'ppp');

tests/screenshot.spec.ts

@@ -19,7 +19,7 @@ import fs from 'fs';
 import { test, expect } from './fixtures.js';
 
 test('browser_take_screenshot (viewport)', async ({ startClient, server }, testInfo) => {
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir: testInfo.outputPath('output') },
   });
   expect(await client.callTool({
@@ -45,7 +45,7 @@ test('browser_take_screenshot (viewport)', async ({ startClient, server }, testI
 });
 
 test('browser_take_screenshot (element)', async ({ startClient, server }, testInfo) => {
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir: testInfo.outputPath('output') },
   });
   expect(await client.callTool({
@@ -76,7 +76,7 @@ test('browser_take_screenshot (element)', async ({ startClient, server }, testIn
 
 test('--output-dir should work', async ({ startClient, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir },
   });
   expect(await client.callTool({
@@ -98,7 +98,7 @@ for (const raw of [undefined, true]) {
   test(`browser_take_screenshot (raw: ${raw})`, async ({ startClient, server }, testInfo) => {
     const outputDir = testInfo.outputPath('output');
     const ext = raw ? 'png' : 'jpeg';
-    const client = await startClient({
+    const { client } = await startClient({
       config: { outputDir },
     });
     expect(await client.callTool({
@@ -138,7 +138,7 @@ for (const raw of [undefined, true]) {
 
 test('browser_take_screenshot (filename: "output.jpeg")', async ({ startClient, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
-  const client = await startClient({
+  const { client } = await startClient({
     config: { outputDir },
   });
   expect(await client.callTool({
@@ -174,7 +174,7 @@ test('browser_take_screenshot (filename: "output.jpeg")', async ({ startClient,
 
 test('browser_take_screenshot (imageResponses=omit)', async ({ startClient, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
-  const client = await startClient({
+  const { client } = await startClient({
     config: {
       outputDir,
       imageResponses: 'omit',
@@ -205,7 +205,7 @@ test('browser_take_screenshot (imageResponses=omit)', async ({ startClient, serv
 test('browser_take_screenshot (cursor)', async ({ startClient, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
 
-  const client = await startClient({
+  const { client } = await startClient({
     clientName: 'cursor:vscode',
     config: { outputDir },
   });

tests/tabs.spec.ts

@@ -141,7 +141,7 @@ test('reuse first tab when navigating', async ({ startClient, cdpServer, server
   const browserContext = await cdpServer.start();
   const pages = browserContext.pages();
 
-  const client = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
+  const { client } = await startClient({ args: [`--cdp-endpoint=${cdpServer.endpoint}`] });
   await client.callTool({
     name: 'browser_navigate',
     arguments: { url: server.HELLO_WORLD },

tests/trace.spec.ts

@@ -22,7 +22,7 @@ import { test, expect } from './fixtures.js';
 test('check that trace is saved', async ({ startClient, server }, testInfo) => {
   const outputDir = testInfo.outputPath('output');
 
-  const client = await startClient({
+  const { client } = await startClient({
     args: ['--save-trace', `--output-dir=${outputDir}`],
   });