test.js

const assert = require('assert');
const exec = cmd => require('child_process').execSync(cmd, { encoding: 'utf8' });
const parse = require('./command-parser');

const multiple = ex => e => it(e, () => {
  const [, bin, args] = e.match(/([\w_]+)(=.*)/);
  const output = JSON.parse(exec(`${ex}${bin} ${args} node -e "process.stdout.write(JSON.stringify(process.env))"`));
  const env = e.split(' ').reduce((env, e) => ({ ...env, [e.split('=')[0]]: e.split('=')[1] }), {});
  for (const [key, val] of Object.entries(env))
    assert.deepEqual([key, val], [key, output[key]]);
});

describe('command-parser', () => {
  const e = (test, expected) => it(test, () => assert.deepEqual(parse(test.split(/ /g)), expected))
  e('ENV=VAL command', { env: { ENV: 'VAL' }, cmd: ['command'] });
  e('a=1 b=2  command', { env: { a: '1', b: 2 }, cmd: ['command'] });
  e(`a='1 2' command`, { env: { a: '1 2' }, cmd: ['command'] });
  e(`a='1 2' b='3 4' command`, { env: { a: '1 2', b: '3 4' }, cmd: ['command'] });
  e(`NODE_OPTIONS='-r next-logger' command`, { env: { NODE_OPTIONS: '-r next-logger' }, cmd: ['command'] });
  // NODE_OPTIONS example in https://nodejs.org/dist/latest-v16.x/docs/api/cli.html#node_optionsoptions
  e(`NODE_OPTIONS='--inspect=localhost:4444' command`, { env: { NODE_OPTIONS: '--inspect=localhost:4444' }, cmd: ['command'] });
});

describe('bin', () => {
  const e = e => it(e, () => assert.equal('ok', exec(`node bin/${e} =ok node -e "process.stdout.write(process.env.${e})"`)));
  e('NODE_ENV');
  e('ENV');
  e('DEBUG');
  e('PORT');
  e('CHAI_JEST_SNAPSHOT_UPDATE_ALL');
  describe('multiple', () => {
    const e = multiple('node bin/');
    e('NODE_ENV=1 ENV=2');
    e('ENV=1 NODE_ENV=2');
    e('PORT=1 ENV=2');
    e('DEBUG=1 ENV=2');
    e('DEBUG=1 CHAI_JEST_SNAPSHOT_UPDATE_ALL=2');
  });
});

describe('CLI', () => {
  /* This module must be npm-link'ed (abd globally accessible) for this test to work */
  const e = e => it(e, () => assert.equal('ok', exec(`${e}=ok node -e "process.stdout.write(process.env.${e})"`)));
  e('NODE_ENV');
  e('ENV');
  e('DEBUG');
  e('PORT');
  e('CHAI_JEST_SNAPSHOT_UPDATE_ALL');
  // e(`NODE_OPTIONS='-r next-logger'`);
  describe('multiple', () => {
    const e = multiple('');
    e('NODE_ENV=1 ENV=2');
    e('ENV=1 NODE_ENV=2');
    e('PORT=1 ENV=2');
    e('DEBUG=1 ENV=2');
    e('CHAI_JEST_SNAPSHOT_UPDATE_ALL=1 ENV=2');
    // e(`NODE_OPTIONS='-r next-logger'`);
    it(';', () => assert.equal('okok', exec(`ENV=1 echo ok; node -e "process.stdout.write('ok')"`).replace(/[\n\r]+/g, '')))
  });
});