chrome-devtools-mcp/tests/McpResponse.test.ts at 7e2ec940f8bc8660c7e41bb192f905b01da54064 · ChromeDevTools/chrome-devtools-mcp · GitHub

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/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import {describe, it} from 'node:test';
import assert from 'assert';

import {getMockRequest, html, withBrowser} from './utils.js';

describe('McpResponse', () => {
  it('list pages', async () => {
    await withBrowser(async (response, context) => {
      response.setIncludePages(true);
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.deepStrictEqual(
        result[0].text,
        `# test response
## Pages
0: about:blank [selected]`,
      );
    });
  });

  it('allows response text lines to be added', async () => {
    await withBrowser(async (response, context) => {
      response.appendResponseLine('Testing 1');
      response.appendResponseLine('Testing 2');
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.deepStrictEqual(
        result[0].text,
        `# test response
Testing 1
Testing 2`,
      );
    });
  });

  it('does not include anything in response if snapshot is null', async () => {
    await withBrowser(async (response, context) => {
      const page = context.getSelectedPage();
      page.accessibility.snapshot = async () => null;
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.deepStrictEqual(result[0].text, `# test response`);
    });
  });

  it('returns correctly formatted snapshot for a simple tree', async () => {
    await withBrowser(async (response, context) => {
      const page = context.getSelectedPage();
      await page.setContent(`<!DOCTYPE html>
<button>Click me</button><input type="text" value="Input">`);
      await page.focus('button');
      response.setIncludeSnapshot(true);
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.strictEqual(
        result[0].text,
        `# test response
## Page content
uid=1_0 RootWebArea ""
  uid=1_1 button "Click me" focusable focused
  uid=1_2 textbox "" value="Input"
`,
      );
    });
  });

  it('returns values for textboxes', async () => {
    await withBrowser(async (response, context) => {
      const page = context.getSelectedPage();
      await page.setContent(
        html`<label
          >username<input
            name="username"
            value="mcp"
        /></label>`,
      );
      await page.focus('input');
      response.setIncludeSnapshot(true);
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.strictEqual(
        result[0].text,
        `# test response
## Page content
uid=1_0 RootWebArea "My test page"
  uid=1_1 StaticText "username"
  uid=1_2 textbox "username" value="mcp" focusable focused
`,
      );
    });
  });

  it('adds throttling setting when it is not null', async () => {
    await withBrowser(async (response, context) => {
      context.setNetworkConditions('Slow 3G');
      const result = await response.handle('test', context);
      assert.equal(result[0].type, 'text');
      assert.strictEqual(
        result[0].text,
        `# test response
## Network emulation
Emulating: Slow 3G
Navigation timeout set to 100000 ms`,
      );
    });
  });

  it('does not include throttling setting when it is null', async () => {
    await withBrowser(async (response, context) => {
      const result = await response.handle('test', context);
      context.setNetworkConditions(null);
      assert.equal(result[0].type, 'text');
      assert.strictEqual(result[0].text, `# test response`);
    });
  });
  it('adds image when image is attached', async () => {
    await withBrowser(async (response, context) => {
      response.attachImage({data: 'imageBase64', mimeType: 'image/png'});
      const result = await response.handle('test', context);
      assert.strictEqual(result[0].text, `# test response`);
      assert.equal(result[1].type, 'image');
      assert.strictEqual(result[1].data, 'imageBase64');
      assert.strictEqual(result[1].mimeType, 'image/png');
    });
  });

  it('adds cpu throttling setting when it is over 1', async () => {
    await withBrowser(async (response, context) => {
      context.setCpuThrottlingRate(4);
      const result = await response.handle('test', context);
      assert.strictEqual(
        result[0].text,
        `# test response
## CPU emulation
Emulating: 4x slowdown`,
      );
    });
  });

  it('does not include cpu throttling setting when it is 1', async () => {
    await withBrowser(async (response, context) => {
      context.setCpuThrottlingRate(1);
      const result = await response.handle('test', context);
      assert.strictEqual(result[0].text, `# test response`);
    });
  });

  it('adds a dialog', async () => {
    await withBrowser(async (response, context) => {
      const page = context.getSelectedPage();
      const dialogPromise = new Promise<void>(resolve => {
        page.on('dialog', () => {
          resolve();
        });
      });
      page.evaluate(() => {
        alert('test');
      });
      await dialogPromise;
      const result = await response.handle('test', context);
      await context.getDialog()?.dismiss();
      assert.strictEqual(
        result[0].text,
        `# test response
# Open dialog
alert: test (default value: test).
Call browser_handle_dialog to handle it before continuing.`,
      );
    });
  });

  it('add network requests when setting is true', async () => {
    await withBrowser(async (response, context) => {
      response.setIncludeNetworkRequests(true);
      context.getNetworkRequests = () => {
        return [getMockRequest()];
      };
      const result = await response.handle('test', context);
      assert.strictEqual(
        result[0].text,
        `# test response
## Network requests
http://example.com GET [pending]`,
      );
    });
  });
  it('does not include network requests when setting is false', async () => {
    await withBrowser(async (response, context) => {
      response.setIncludeNetworkRequests(false);
      context.getNetworkRequests = () => {
        return [getMockRequest()];
      };
      const result = await response.handle('test', context);
      assert.strictEqual(result[0].text, `# test response`);
    });
  });

  it('add network request when attached', async () => {
    await withBrowser(async (response, context) => {
      response.setIncludeNetworkRequests(true);
      const request = getMockRequest();
      context.getNetworkRequests = () => {
        return [request];
      };
      response.attachNetworkRequest(request.url());
      const result = await response.handle('test', context);
      assert.strictEqual(
        result[0].text,
        `# test response
## Request http://example.com
Status:  [pending]
### Request Headers
- content-size:10
## Network requests
http://example.com GET [pending]`,
      );
    });
  });

  it('adds console messages when the setting is true', async () => {
    await withBrowser(async (response, context) => {
      response.setIncludeConsoleData(true);
      const page = context.getSelectedPage();
      const consoleMessagePromise = new Promise<void>(resolve => {
        page.on('console', () => {
          resolve();
        });
      });
      page.evaluate(() => {
        console.log('Hello from the test');
      });
      await consoleMessagePromise;
      const result = await response.handle('test', context);
      assert.ok(result[0].text);
      // Cannot check the full text because it contains local file path
      assert.ok(
        result[0].text.toString().startsWith(`# test response
## Console messages
Log>`),
      );
      assert.ok(result[0].text.toString().includes('Hello from the test'));
    });
  });
});