func Test_exec(t *testing.T) {
  engine.Initialize()
  ctx := &engine.Context{
    Output: os.Stdout,
  }
  err := engine.RequestStartup(ctx)
  if err != nil {
    fmt.Println(err)
  }
  defer engine.RequestShutdown(ctx)
  err = ctx.Exec("/tmp/index.php")
  if err != nil {
    fmt.Println(err)
  }
}