const {dig} = require('./_30s.js');

const data = {
  level1: {
    level2: {
      level3: 'some data',
      level3f: false,
      level3a: [1, 2, 3, 4]
    }
  }
};

test('dig is a Function', () => {
  expect(dig).toBeInstanceOf(Function);
});

test('Dig target success', () => {
  expect(dig(data, 'level3')).toEqual('some data');
});

test('Dig target with falsy value', () => {
  expect(dig(data, 'level3f')).toEqual(false);
});

test('Dig target with array', () => {
  expect(dig(data, 'level3a')).toEqual([1, 2, 3, 4]);
});

test('Unknown target return undefined', () => {
  expect(dig(data, 'level4')).toEqual(undefined);
});