text: const assert = require("assert");
  
  const dotenvJSON = require("../index");
  
  assert.ok(!process.env.hasOwnProperty("current_filename"));
  
  dotenvJSON({dir: 'test', env: 'production'}); // loads test/.env.production.json
  
  assert.ok(process.env.hasOwnProperty("current_filename"));
  assert.equal(process.env.current_filename, '.env.production.json');
  