test.js

const assert = require('assert');

const sum = require('./sum');
const sum2 = require('./sum2');

describe('Day 7: The Sum of Its Parts', () => {
  it('should determine order of steps', () => {
    const instructions =
      `Step C must be finished before step A can begin.
       Step C must be finished before step F can begin.
       Step A must be finished before step B can begin.
       Step A must be finished before step D can begin.
       Step B must be finished before step E can begin.
       Step D must be finished before step E can begin.
       Step F must be finished before step E can begin.`;

    assert.strictEqual(sum(instructions), 'CABDFE');
  });

  describe('Part Two', () => {
    it('should determine work duration', () => {
      const instructions =
        `Step C must be finished before step A can begin.
         Step C must be finished before step F can begin.
         Step A must be finished before step B can begin.
         Step A must be finished before step D can begin.
         Step B must be finished before step E can begin.
         Step D must be finished before step E can begin.
         Step F must be finished before step E can begin.`;

      assert.strictEqual(sum2(instructions, 2, 0), 15);
    });
  });
});