Library code in test

add.test.js

// test/arithmetic/add.test.js
import { add } from '../../src';

test('Two integers should get added up', () => {
  expect(add(2, 3)).toBe(5);
  expect(add(-1, 0)).toBe(-1);
});

max.test.js

// test/range/max.test.js
import { max } from '../../src';

test('Should give max entry from a given array', () => {
  expect(max([1, 3, 4])).toBe(4);
  expect(max([1, 10, 10])).toBe(10);
  expect(max([-1, -5, 0])).toBe(0);
});