diff --git a/tw/twdataloader/helpers.go b/tw/twdataloader/helpers.go
index 27f25f8..c12e576 100644
--- a/tw/twdataloader/helpers.go
+++ b/tw/twdataloader/helpers.go
@@ -5,6 +5,7 @@ import (
 	"encoding/csv"
 	"io"
 	"net/http"
+	"net/http/httptest"
 	"time"
 )
 
@@ -22,3 +23,41 @@ func uncompressAndReadCsvLines(r io.Reader) ([][]string, error) {
 	defer uncompressedStream.Close()
 	return csv.NewReader(uncompressedStream).ReadAll()
 }
+
+type handlers struct {
+	getServers http.HandlerFunc
+}
+
+func (h *handlers) init() {
+	noop := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+	})
+	if h.getServers == nil {
+		h.getServers = noop
+	}
+}
+
+func prepareTestServer(h *handlers) *httptest.Server {
+	if h == nil {
+		h = &handlers{}
+	}
+	h.init()
+	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case EndpointGetServers:
+			h.getServers(w, r)
+			return
+		default:
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+}
+
+func createWriteStringHandler(resp string) http.HandlerFunc {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, err := w.Write([]byte(resp))
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+		}
+	})
+}
diff --git a/tw/twdataloader/version_data_loader_test.go b/tw/twdataloader/version_data_loader_test.go
index ef015e2..aa69808 100644
--- a/tw/twdataloader/version_data_loader_test.go
+++ b/tw/twdataloader/version_data_loader_test.go
@@ -2,28 +2,11 @@ package twdataloader
 
 import (
 	"github.com/stretchr/testify/assert"
-	"net/http"
-	"net/http/httptest"
 	"strconv"
 	"strings"
 	"testing"
 )
 
-func prepareTestServer(resp string) *httptest.Server {
-	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		switch r.URL.Path {
-		case EndpointGetServers:
-			_, err := w.Write([]byte(resp))
-			if err != nil {
-				w.WriteHeader(http.StatusInternalServerError)
-			}
-			return
-		default:
-			w.WriteHeader(http.StatusNotFound)
-		}
-	}))
-}
-
 func TestLoadServers(t *testing.T) {
 	t.Run("invalid response", func(t *testing.T) {
 		type scenario struct {
@@ -55,7 +38,9 @@ func TestLoadServers(t *testing.T) {
 		}
 
 		for _, scenario := range scenarios {
-			ts := prepareTestServer(scenario.resp)
+			ts := prepareTestServer(&handlers{
+				getServers: createWriteStringHandler(scenario.resp),
+			})
 
 			dl := NewVersionDataLoader(&VersionDataLoaderConfig{
 				Host:   strings.ReplaceAll(ts.URL, "https://", ""),
@@ -72,7 +57,9 @@ func TestLoadServers(t *testing.T) {
 
 	t.Run("success", func(t *testing.T) {
 		resp := `a:19:{s:5:"pl150";s:25:"https://pl150.plemiona.pl";s:5:"pl151";s:25:"https://pl151.plemiona.pl";s:5:"pl152";s:25:"https://pl152.plemiona.pl";s:5:"pl153";s:25:"https://pl153.plemiona.pl";s:5:"pl154";s:25:"https://pl154.plemiona.pl";s:5:"pl155";s:25:"https://pl155.plemiona.pl";s:5:"pl156";s:25:"https://pl156.plemiona.pl";s:5:"pl157";s:25:"https://pl157.plemiona.pl";s:5:"pl158";s:25:"https://pl158.plemiona.pl";s:5:"pl159";s:25:"https://pl159.plemiona.pl";s:5:"pl160";s:25:"https://pl160.plemiona.pl";s:5:"pl161";s:25:"https://pl161.plemiona.pl";s:5:"pl162";s:25:"https://pl162.plemiona.pl";s:5:"pl163";s:25:"https://pl163.plemiona.pl";s:5:"pl164";s:25:"https://pl164.plemiona.pl";s:4:"plp7";s:24:"https://plp7.plemiona.pl";s:5:"pl165";s:25:"https://pl165.plemiona.pl";s:5:"pl166";s:25:"https://pl166.plemiona.pl";s:5:"pl167";s:25:"https://pl167.plemiona.pl";}`
-		ts := prepareTestServer(resp)
+		ts := prepareTestServer(&handlers{
+			getServers: createWriteStringHandler(resp),
+		})
 		defer ts.Close()
 
 		expectedLength, err := strconv.Atoi(strings.Split(resp, ":")[1])