mr-pascal

//------------------------------------------------
// index.js
//-----------------------------------------------

// Import method to call the external service
const {callExternalService} = require('./externalService');
// Method to test
const main = () => {
  // We only call the external service and return its response
  return callExternalService();

mr-pascal

## Run all tests
npm run test
## Delete `dist` folder
npm run clean
## Trigger a clean build
npm run build
## Start the server using the output from `npm run build`
npm run start
## Directly start the server via the TypeScript files
npm run dev

mr-pascal

// src/index.ts
import {gql} from 'mercurius-codegen';
const typeDefs = gql`
    type Query {
        """ Method to add two integers """
        add(
            " First integer "
            x: Int,
            " Second integer "
            y: Int

mr-pascal

// src/index.ts
const resolvers = {
    Query: {
        /**
         * Simple resolver to add two numbers
         * @param {object} _
         * @param {number} x  First number
         * @param {number} y Second number
         */
        add: async (_: unknown, {x, y}: { x: number, y: number }): Promise<number> => x + y,

mr-pascal

// src/index.ts
import fastify, {FastifyInstance} from 'fastify';
import {Server, IncomingMessage, ServerResponse} from 'http';
/**
 * Create instance of our Fastify server
 */
export const app: FastifyInstance<Server, IncomingMessage, ServerResponse> = fastify({logger: false});
// ---------------------------------------------------
import mercurius from 'mercurius';
import {makeExecutableSchema} from '@graphql-tools/schema';

mr-pascal

// src/tests/integration.spec.ts
import * as request from 'supertest';
import {app} from '../index';
import {gql} from 'mercurius-codegen';
describe(`Integration`, () => {
    // 1. Just some small helper to wrap GraphQL success responses in the 'data' property
    const successResponse = (response: object): { data: object } => ({data: response});

    beforeEach(async () => {
        // 2. Wait for our server to become ready to respond to requests

mr-pascal

// jest.config.js
module.exports = {

    /**
    * 1.
    * Add some TypeScript specific Jest configuration (not needed if you use plain JS)
    */ 
    transform: {
        '^.+\\.tsx?$': 'ts-jest',
    },

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// jest.setup.ts
import {MongoMemoryServer} from 'mongodb-memory-server';
import {Collection, Db, MongoClient} from 'mongodb';
import {PERSON_COLLECTION} from './src/constants';

let mongo: MongoMemoryServer;
let mongoClient: MongoClient;
let db: Db;

mr-pascal

// jest-mongodb-config.js
/**
 * Don't change the name of this file.
 * The name is hardcoded inside the '@shelf/jest-mongodb' npm module!
 */

module.exports = {
    /**
     * Define some defaults to use for the in-memory MongoDB
     */

mr-pascal

// src/dbhelper.spec.ts
import {DBHelper} from './dbhelper';
import {IPerson} from './models/person.interface';

/**
 * Start our test file where we test our DBHelper class
 */
describe(`DBHelper`, () => {
    /**
     * 1.