feat: let piping of rejected processes - #1296

it('fulfilled piping', async () => {
  const p1 = $`echo foo && sleep 0.1 && echo bar`
  await p1
  const p2 = p1.pipe`cat`
  await p2

  assert.equal(p1.output.toString(), 'foo\nbar\n')
  assert.equal(p2.output.toString(), 'foo\nbar\n')
})

it('rejected piping', async () => {
  const p1 = $({ nothrow: true })`echo foo && exit 1`
  await p1
  const p2 = p1.pipe($({ nothrow: true })`cat`)
  await p2

  assert.equal(p1.output.toString(), 'foo\n')
  assert.equal(p1.output.ok, false)
  assert.equal(p1.output.exitCode, 1)

  assert.equal(p2.output.toString(), 'foo\n')
  assert.equal(p2.output.ok, false)
  assert.equal(p2.output.exitCode, 1)
})