MCP Echo Env

import test from "node:test"; import assert from "node:assert/strict"; import process from "node:process"; import { fileURLToPath } from "node:url"; import { dirname, resolve } from "node:path"; import { Client } from "@modelcontextprotocol/sdk/client/index.js"; import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js"; const __filename = fileURLToPath(import.meta.url); const __dirname = dirname(__filename); const projectRoot = resolve(__dirname, ".."); const serverEntry = resolve(projectRoot, "index.js"); test("env_echo returns expected variables", async (t) => { const transport = new StdioClientTransport({ command: process.execPath, args: [serverEntry], cwd: projectRoot, env: { ...process.env, WORKSPACE_SLUG: "smoke-test-workspace", MCP_ECHO_ENV_LOG_LEVEL: "error", }, stderr: "pipe", }); const logs = []; const stderrStream = transport.stderr; if (stderrStream) { stderrStream.setEncoding("utf8"); stderrStream.on("data", (chunk) => { logs.push(chunk); }); } const client = new Client({ name: "mcp-echo-env-smoke-test", version: "1.0.0", }); t.after(async () => { await client.close(); }); await client.connect(transport); await client.listTools({}); const { structuredContent, isError } = await client.callTool({ name: "env_echo", arguments: {}, }); assert.equal(Boolean(isError), false, "Tool call should succeed"); assert.ok(structuredContent, "Structured content should be present"); assert.equal(structuredContent.tool, "env_echo"); assert.ok(structuredContent.variables, "variables map should exist"); assert.equal( structuredContent.variables.WORKSPACE_SLUG, "smoke-test-workspace" ); assert.equal( structuredContent.variables.PWD, projectRoot, `${JSON.stringify(structuredContent, null, 2)}\nLogs:\n${logs.join("")}` ); assert.deepEqual( Object.keys(structuredContent.variables).sort(), ["PWD", "WORKSPACE_SLUG"] ); });