const cwd = tmpdir()
const external = tmpdir()
await fs.outputJson(path.join(external, 'node_modules/a/package.json'), {
  name: 'a',
  version: '1.0.0',
  type: 'module',
  exports: './index.js',
})
await fs.outputFile(
  path.join(external, 'node_modules/a/index.js'),
  `
export const a = 'AAA'
`
)
const script = `
import {a} from 'a'
console.log(a);
`
const out = await $`zx --cwd=${cwd} --prefer-local=${external} --test <<< ${script}`
assert.equal(out.stdout, 'AAA\n')

const p = $({prefix: '', postfix: ''})`echo ${[1, '', '*', '2']}`

// before
p.cmd //  `echo 1  $'*' 2`) 

// after
p.cmd //  `echo 1 $'' $'*' 2`) 

const err = new Error('BrokenSpawn')
const o = await $({
  nothrow: true,
  spawn() {
    throw err
  },
})`echo foo`
o.ok       // false
o.exitCode // null
o.message  // BrokenSpawn...
o.cause    // err