nano-service/tests/service.test.ts

import NatsAdaptor from "../src/adaptors/nats";
import { RequestError } from "../src/error";
import { Message } from "../src/messages";
import Service from "../src/service";

let srv!: Service;

const natsServer = '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 (msg: Message<string>) => {
        return {data: msg.data, statusCode: statusCodeExpected};
    });

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

    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 (msg: Message<string>) => {
        return {data: msg.data, statusCode: statusCodeExpected};
    });

    await srv.listen();
    expect(srv.request(adaptorName, {service: serviceName, subject: subject, data: dataExpected})).rejects.toThrow(RequestError);
});

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 (msg: Message<string>) => {
        return {data: msg.data, statusCode: statusCodeExpected};
    });

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