You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: driver_test.go
    path of file: ./repos/migrate/source/httpfs
    
    the code of the file until where you have to start completion: package httpfs_test

import (
	"net/http"
	"testing"

	"github.com/golang-migrate/
    
func TestOpen(t *testing.T) {
	d, err := httpfs.New(http.Dir("testdata/sql"), "")
	if err != nil {
		t.Error("New() expected no error")
		return
	}
	d, err = d.Open("")
	if d != nil {
		t.Error("Open() expected to return nil driver")
	}
	if err == nil {
		t.Error("Open() expected to return error")
	}
}