javascript-2-b.spec.js

// @ts-check

import { extract } from "./javascript-2-b";

const TEAM = {
  name: "Buzzer Beaters",
  coach: {
    name: "Nancy",
    achievements: {
      titles: 2,
      hallOfFame: true
    }
  },
  location: {
    town: "Miami",
    state: "Florida"
  },
  players: [
    { name: "Candace", position: "Point guard" },
    { name: "Dawn", position: "Center" }
  ]
};

describe("extract", () => {
  test(`property: name`, () => {
    expect(extract(TEAM, "name")).toEqual("Buzzer Beaters");
  });

  test(`property: coach -> name`, () => {
    expect(extract(TEAM, "coach.name")).toEqual("Nancy");
  });

  test(`property: coach -> achievement -> titles`, () => {
    expect(extract(TEAM, "coach.achievements.titles")).toEqual(2);
  });

  test(`property: coach -> achievement -> hallOfFame`, () => {
    expect(extract(TEAM, "coach.achievements.hallOfFame")).toEqual(true);
  });

  test(`property: location`, () => {
    expect(extract(TEAM, "location")).toEqual({
      town: "Miami",
      state: "Florida"
    });
  });

  test(`property: unknown`, () => {
    expect(extract(TEAM, "unknown")).toEqual(null);
  });

  test(`property: players[0] -> name`, () => {
    expect(extract(TEAM, "players[0].name")).toEqual("Candace");
  });

  test(`property: players[1] -> position`, () => {
    expect(extract(TEAM, "players[1].position")).toEqual("Center");
  });

  test(`property: players[4] -> name`, () => {
    expect(extract(TEAM, "players[4].name")).toEqual(null);
  });
});