dockertest: Error when creating docker container: no such host

(Docker version is 1.13.1)

I was using the example MongoDB code to create a mongo container in my test case and encountered this no such host error when connecting:

Post http://unix.sock/containers/create?: dial tcp: lookup unix.sock: no such host

Suspected a OS X platform issue, I also tried to run the test case on Travis CI with the following configuration:

language: go
sudo: required

go:
- 1.7

services:
- docker

but got the same error.

Here is the code that caused the problem, it is essentially same with the example code:

func connectToDockerMongo(t *testing.T) (*dockertest.Pool, *dockertest.Resource) {
	pool, err := dockertest.NewPool("")
	fatalIfError(t, err)

	dockerResource, err := pool.Run("mongo", "3.3", []string{""})
	fatalIfError(t, err)

	err = pool.Retry(func() error {
		var e error
		session, e := mgo.Dial(fmt.Sprintf("localhost:%s", dockerResource.GetPort("27017")))
		if e != nil {
			t.Error(e)
			return e
		}
		return session.Ping()
	})
	fatalIfError(t, err)

	return pool, dockerResource
}

Basically, pool.Run("mongo", "3.3", []string{""}) is failing.

Could someone please help. Thanks!