/**
* MCP Resources — accessibility-snapshot tests.
* Requires a browser session with a loaded page.
*/
import { describe, it, before, after } from 'node:test';
import assert from 'node:assert/strict';
import { McpClient, fixture } from './mcp-client.mjs';
describe('Resources', () => {
let client;
before(async () => {
client = new McpClient();
await client.start();
await client.callTool('start_browser', {
browser: 'chrome',
options: { headless: true, arguments: ['--no-sandbox', '--disable-dev-shm-usage'] },
});
await client.callTool('navigate', { url: fixture('locators.html') });
});
after(async () => {
try { await client.callTool('close_session'); } catch { /* ignore */ }
await client.stop();
});
describe('accessibility://current', () => {
it('should include page elements with roles, levels, and IDs', async () => {
const result = await client.readResource('accessibility://current');
assert.equal(result.contents[0].mimeType, 'application/json');
const tree = JSON.parse(result.contents[0].text);
const headings = findNodes(tree, (n) => n.role === 'heading');
assert.ok(headings.length > 0, 'Should find at least one heading');
assert.equal(headings[0].level, 1, 'H1 should have level 1');
const buttons = findNodes(tree, (n) => n.role === 'button');
const links = findNodes(tree, (n) => n.role === 'link');
const textboxes = findNodes(tree, (n) => n.role === 'textbox');
assert.ok(buttons.length > 0, 'Should find at least one button');
assert.ok(links.length > 0, 'Should find at least one link');
assert.ok(textboxes.length > 0, 'Should find at least one textbox');
const ids = findNodes(tree, (n) => n.id).map((n) => n.id);
assert.ok(ids.includes('title'), 'Should include #title');
assert.ok(ids.includes('btn'), 'Should include #btn');
assert.ok(ids.includes('input'), 'Should include #input');
});
it('should not include script or style content', async () => {
await client.callTool('execute_script', {
script: `
var s = document.createElement('script'); s.textContent = 'var secret = 42;'; document.body.appendChild(s);
var c = document.createElement('style'); c.textContent = 'body { color: red; }'; document.body.appendChild(c);
`
});
const result = await client.readResource('accessibility://current');
const text = result.contents[0].text;
assert.ok(!text.includes('secret'), 'Tree should not contain script content');
assert.ok(!text.includes('color: red'), 'Tree should not contain style content');
});
// Separate client needed: the main client already has a browser session,
// and we need a clean session with no browser to test the no-session error path.
it('should return error code -32002 when reading with no session', async () => {
const freshClient = new McpClient();
await freshClient.start();
try {
await freshClient.readResource('accessibility://current');
assert.fail('Should have thrown');
} catch (e) {
assert.ok(e.message.includes('-32002') || e.message.includes('No active browser session'), `Expected -32002 error, got: ${e.message}`);
} finally {
await freshClient.stop();
}
});
});
});
/** Recursively find nodes matching a predicate. */
function findNodes(node, predicate) {
if (!node) return [];
const results = [];
if (predicate(node)) results.push(node);
if (node.children) {
for (const child of node.children) {
results.push(...findNodes(child, predicate));
}
}
return results;
}
