WRNexusJS/examples/inter-app-api-showcase/app/live-integration.test.ts

import { afterEach, expect, test } from "bun:test";
import { implement } from "@wrnexus/rpc";
import { handleRpcRequest } from "../../../packages/dev-server/src/rpc-dispatch.ts";
import { GET } from "./api/product-summary.ts";
import { auditService, catalogService } from "./lib/contracts.ts";

const savedFetch = globalThis.fetch;
const savedSecret = process.env.WRNEXUS_RPC_SECRET;
const savedApp = process.env.WRNEXUS_APP_NAME;
const savedOrigins = process.env.WRNEXUS_INTERNAL_ORIGINS;

afterEach(() => {
  globalThis.fetch = savedFetch;
  if (savedSecret === undefined) delete process.env.WRNEXUS_RPC_SECRET;
  else process.env.WRNEXUS_RPC_SECRET = savedSecret;
  if (savedApp === undefined) delete process.env.WRNEXUS_APP_NAME;
  else process.env.WRNEXUS_APP_NAME = savedApp;
  if (savedOrigins === undefined) delete process.env.WRNEXUS_INTERNAL_ORIGINS;
  else process.env.WRNEXUS_INTERNAL_ORIGINS = savedOrigins;
});

test("coordinator reaches two peer-app listeners and an external API", async () => {
  process.env.WRNEXUS_RPC_SECRET = "test-rpc-secret-at-least-32-chars-long";
  process.env.WRNEXUS_APP_NAME = "product-summary";
  const catalog = implement(
    catalogService,
    {
      getProduct: ({ sku }) => ({ sku, displayName: "Starter", enabled: true }),
    },
    { selfApp: "catalog" },
  );
  const audit = implement(
    auditService,
    {
      recordLookup: () => ({ eventId: "audit_1" }),
    },
    { selfApp: "audit" },
  );
  const catalogServer = Bun.serve({
    port: 0,
    hostname: "127.0.0.1",
    async fetch(request) {
      return (
        (await handleRpcRequest(request, new URL(request.url), new Map([["catalog", catalog]]))) ??
        new Response("Not found", { status: 404 })
      );
    },
  });
  const auditServer = Bun.serve({
    port: 0,
    hostname: "127.0.0.1",
    async fetch(request) {
      return (
        (await handleRpcRequest(request, new URL(request.url), new Map([["audit", audit]]))) ??
        new Response("Not found", { status: 404 })
      );
    },
  });
  process.env.WRNEXUS_INTERNAL_ORIGINS = JSON.stringify({
    catalog: `http://127.0.0.1:${catalogServer.port}`,
    audit: `http://127.0.0.1:${auditServer.port}`,
  });
  globalThis.fetch = ((input: RequestInfo | URL, init?: RequestInit) => {
    if (String(input) === "https://api.github.com/repos/octocat/Hello-World") {
      return Promise.resolve(
        Response.json({ full_name: "octocat/Hello-World", stargazers_count: 7 }),
      );
    }
    return savedFetch(input, init);
  }) as typeof fetch;
  try {
    const response = await GET({
      req: new Request("http://coordinator.test/api/product-summary?sku=starter"),
      user: { id: "u1" },
      locals: {},
    } as never);
    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({
      product: { sku: "starter", displayName: "Starter", enabled: true },
      external: { repository: "octocat/Hello-World", stars: 7 },
      audit: { eventId: "audit_1" },
    });
  } finally {
    catalogServer.stop(true);
    auditServer.stop(true);
  }
});