/tests/index.test.ts

/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import assert from 'node:assert';
import fs from 'node:fs';
import {describe, it} from 'node:test';

import {Client} from '@modelcontextprotocol/sdk/client/index.js';
import {StdioClientTransport} from '@modelcontextprotocol/sdk/client/stdio.js';
import {executablePath} from 'puppeteer';

import type {ToolDefinition} from '../src/tools/ToolDefinition';

describe('e2e', () => {
  async function withClient(
    cb: (client: Client) => Promise<void>,
    extraArgs: string[] = [],
  ) {
    const transport = new StdioClientTransport({
      command: 'node',
      args: [
        'build/src/bin/chrome-devtools-mcp.js',
        '--headless',
        '--isolated',
        '--executable-path',
        executablePath(),
        ...extraArgs,
      ],
    });
    const client = new Client(
      {
        name: 'e2e-test',
        version: '1.0.0',
      },
      {
        capabilities: {},
      },
    );

    try {
      await client.connect(transport);
      await cb(client);
    } finally {
      await client.close();
    }
  }
  it('calls a tool', async t => {
    await withClient(async client => {
      const result = await client.callTool({
        name: 'list_pages',
        arguments: {},
      });
      t.assert.snapshot?.(JSON.stringify(result.content));
    });
  });

  it('calls a tool multiple times', async t => {
    await withClient(async client => {
      let result = await client.callTool({
        name: 'list_pages',
        arguments: {},
      });
      result = await client.callTool({
        name: 'list_pages',
        arguments: {},
      });
      t.assert.snapshot?.(JSON.stringify(result.content));
    });
  });

  it('has all tools', async () => {
    await withClient(async client => {
      const {tools} = await client.listTools();
      const exposedNames = tools.map(t => t.name).sort();
      const files = fs.readdirSync('build/src/tools');
      const definedNames = [];
      for (const file of files) {
        if (
          file === 'ToolDefinition.js' ||
          file === 'tools.js' ||
          file === 'slim'
        ) {
          continue;
        }
        const fileTools = await import(`../src/tools/${file}`);
        for (const maybeTool of Object.values<unknown>(fileTools)) {
          if (typeof maybeTool === 'function') {
            const tool = (maybeTool as (val: boolean) => ToolDefinition)(false);
            if (tool && typeof tool === 'object' && 'name' in tool) {
              if (tool.annotations?.conditions) {
                continue;
              }
              definedNames.push(tool.name);
            }
            continue;
          }
          if (
            typeof maybeTool === 'object' &&
            maybeTool !== null &&
            'name' in maybeTool
          ) {
            const tool = maybeTool as ToolDefinition;
            if (tool.annotations?.conditions) {
              continue;
            }
            definedNames.push(tool.name);
          }
        }
      }
      definedNames.sort();
      assert.deepStrictEqual(exposedNames, definedNames);
    });
  });

  it('has experimental extensions tools', async () => {
    await withClient(
      async client => {
        const {tools} = await client.listTools();
        const clickAt = tools.find(t => t.name === 'install_extension');
        assert.ok(clickAt);
      },
      ['--category-extensions'],
    );
  });

  it('has experimental vision tools', async () => {
    await withClient(
      async client => {
        const {tools} = await client.listTools();
        const clickAt = tools.find(t => t.name === 'click_at');
        assert.ok(clickAt);
      },
      ['--experimental-vision'],
    );
  });

  it('has experimental interop tools', async () => {
    await withClient(
      async client => {
        const {tools} = await client.listTools();
        const getTabId = tools.find(t => t.name === 'get_tab_id');
        assert.ok(getTabId);
      },
      ['--experimental-interop-tools'],
    );
  });
});