nano-service/tests/service.test.ts

import { afterEach, beforeEach, expect, test } from "bun:test";
import { z } from "zod";
import NatsAdaptor from "../src/adaptors/nats";
import { RequestError } from "../src/error";
import Service from "../src/service";

let srv!: Service;

const natsServer = Bun.env.NATS_HOST || "127.0.0.1:4222";
const serviceName = "test-service";
const adaptorName = "nats";
const subject = "test";

beforeEach(() => {
	srv = new Service(serviceName);
});

afterEach(async () => {
	await srv.stop();
});

test("request success", async () => {
	const dataExpected = "hello success";
	const statusCodeExpected = 200;

	srv.addAdaptor(adaptorName, new NatsAdaptor({ servers: [natsServer] }));
	srv.subscribe(
		adaptorName,
		subject,
		async (srv, msg) => {
			return { data: msg.data, statusCode: statusCodeExpected };
		},
		z.string(),
	);

	await srv.listen();

	const res = await srv.request(
		adaptorName,
		{
			service: serviceName,
			subject: subject,
			data: dataExpected,
		},
		z.string(),
	);

	expect(res.data).toBe(dataExpected);
	expect(res.statusCode).toBe(statusCodeExpected);
});

test("request error", async () => {
	const dataExpected = "hello error";
	const statusCodeExpected = 500;

	srv.addAdaptor(adaptorName, new NatsAdaptor({ servers: [natsServer] }));
	srv.subscribe(adaptorName, subject, async (srv, msg) => {
		throw new RequestError("request error", 500);
	});

	await srv.listen();
	expect(() => {
		return srv.request(
			adaptorName,
			{
				service: serviceName,
				subject: subject,
				data: dataExpected,
			},
			z.string(),
		);
	}).toThrow();
});

test("request adaptor not found", async () => {
	const dataExpected = "hello success";
	const statusCodeExpected = 200;

	srv.addAdaptor(adaptorName, new NatsAdaptor({ servers: [natsServer] }));
	srv.subscribe(adaptorName, subject, async (srv, msg) => {
		return { data: msg.data, statusCode: statusCodeExpected };
	});

	await srv.listen();
	expect(() => {
		return srv.request("bad adaptor", {
			service: serviceName,
			subject: subject,
			data: dataExpected,
		});
	}).toThrow();
});