text: const assume = require('assume');
  
  describe('index', () => {
    it('exposes expected function', () => {
      const utils = require('../lib');
  
      const expected = [
        'tryRequire',
        'applyEnvironmentOverrides',
        'runShellCommand',
        'PackageManager'
      ];
  
      assume(expected.every(k => k in utils)).true();
      assume(Object.keys(utils)).lengthOf(expected.length);
    });
  });
  