Service.test.js

import { getUserData } from '../Service';

const USER_ID = 1;
const USER_INFO = {
    name: ‘Bruce Wayne’,
    age: 32,
    gender: ‘male’,
    mail: ‘batman@dccomics.com’
}

describe("Callbacks", () => {
  it("should return the user personal data", (done) => {
    function callback(userInfo) = {
      expect(userInfo).toBe(USER_INFO);
      done();
    }
    getUserData(callback);
  });
});

describe("Promises", () => {
  it("should return the user personal data", () => {
    return getUserData(USER_ID)
      .then(userInfo => {
        expect(userInfo).toBe(USER_INFO);
      });
  });

  it("should return error if USER_ID is not provided", () => {
    return getUserData()
      .catch(error => expect(error).toMatch(‘error’));
  });
});

describe("Async/Await", () => {
  it("should return the user personal data", async () => {
    const userInfo = await getUserData(USER_ID);
    expect(userInfo).toBe(USER_INFO);
  });

  it("should return error if USER_ID is not provided", async () => {
    try {
      await getUserData();
    } catch(error) {
      expect(error).toMatch(‘error’);
    }
  });
});

describe("Mix", () => {
  it("should return the user personal data", (done) => {
    getUserData(USER_ID)
      .then(({userInfo}) => {
        expect(userInfo).toEqual(USER_INFO);
        done();
    });
  });

  it("should return error if USER_ID is not provided", (done) => {
    getUserData()
      .catch(error => {
        expect(error).toMatch(‘error’);
        done();
    });
  });
});