83 lines
2.7 KiB
TypeScript
83 lines
2.7 KiB
TypeScript
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import { expect, test } from 'bun:test';
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import type { ToolSet } from 'ai';
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import { join } from 'node:path';
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import { connectMcp } from '../src/mcp';
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const STUB = join(import.meta.dir, 'fixtures', 'mcp-stub.ts');
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const stdioServer = () => ({ command: process.execPath, args: ['run', STUB] });
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/** MCP tools are dynamic, so their input type is only known at runtime. */
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const call = async (tools: ToolSet, name: string, input: Record<string, unknown>) => {
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const tool = tools[name];
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if (!tool?.execute) throw new Error(`tool ${name} is not executable`);
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return tool.execute(input as never, { toolCallId: 'x', messages: [] } as never);
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};
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test('a stdio server contributes its tools under an mcp__ namespace', async () => {
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const mcp = await connectMcp({ stub: stdioServer() });
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try {
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expect(Object.keys(mcp.tools).sort()).toEqual(['mcp__stub__ping', 'mcp__stub__search']);
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expect(mcp.errors).toEqual([]);
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} finally {
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await mcp.close();
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}
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}, 30_000);
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test('an mcp tool actually executes against the server', async () => {
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const mcp = await connectMcp({ stub: stdioServer() });
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try {
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const out = await call(mcp.tools, 'mcp__stub__ping', { note: 'hello' });
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expect(JSON.stringify(out)).toContain('pong: hello');
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} finally {
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await mcp.close();
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}
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}, 30_000);
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test('two servers exposing the same tool name do not shadow each other', async () => {
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const mcp = await connectMcp({ a: stdioServer(), b: stdioServer() });
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try {
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expect(Object.keys(mcp.tools).sort()).toEqual([
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'mcp__a__ping',
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'mcp__a__search',
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'mcp__b__ping',
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'mcp__b__search',
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]);
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} finally {
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await mcp.close();
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}
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}, 30_000);
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test('a server that fails to start is reported, not fatal', async () => {
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const mcp = await connectMcp({
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ok: stdioServer(),
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broken: { command: 'definitely-not-a-real-binary-xyz' },
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});
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try {
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expect(Object.keys(mcp.tools)).toEqual(['mcp__ok__ping', 'mcp__ok__search']);
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expect(mcp.errors.map((e) => e.server)).toEqual(['broken']);
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expect(mcp.errors[0]?.message).toBeTruthy();
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} finally {
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await mcp.close();
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}
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}, 30_000);
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test('no configured servers yields no tools and no errors', async () => {
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const mcp = await connectMcp({});
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expect(mcp.tools).toEqual({});
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expect(mcp.errors).toEqual([]);
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await mcp.close();
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});
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test('close is safe to call twice', async () => {
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const mcp = await connectMcp({ stub: stdioServer() });
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await mcp.close();
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await mcp.close();
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});
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test('an http server config is attempted and its failure reported', async () => {
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const mcp = await connectMcp({ remote: { url: 'http://127.0.0.1:1/mcp', type: 'http' } });
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expect(Object.keys(mcp.tools)).toEqual([]);
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expect(mcp.errors.map((e) => e.server)).toEqual(['remote']);
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await mcp.close();
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}, 30_000);
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