func setup() {
	mux = http.NewServeMux()
	server = httptest.NewTLSServer(mux)
	u, _ := url.Parse(server.URL)
	testHost = u.Host
	client = NewClient(&http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
		},
	})
}
setup a local HTTP server for testing
package webfinger
import (
	"crypto/tls"
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/url"
	"reflect"
	"testing"
	"github.com/ant0ine/go-webfinger/jrd"
)
var (
	mux *http.ServeMux
	server *httptest.Server
	testHost string
	client *Client
)