diff --git a/test/unit/fetcher.js b/test/unit/fetcher.js
index 10a0d46e1c..29d90de29e 100644
--- a/test/unit/fetcher.js
+++ b/test/unit/fetcher.js
@@ -3,11 +3,12 @@ import { HttpsProxyAgent } from 'https-proxy-agent';
 import Fetcher from 'Provider/Fetcher';
 import { DataTexture, Texture } from 'three';
 
+const itownsdataUrl = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master';
+
 describe('Fetcher', function () {
     const networkOptions = process.env.HTTPS_PROXY ? { agent: new HttpsProxyAgent(process.env.HTTPS_PROXY) } : {};
     describe('text', function () {
-        const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-        'altitude-conversion-grids/EGM2008.gdf';
+        const url = `${itownsdataUrl}/altitude-conversion-grids/EGM2008.gdf`;
         it('should load a text file', (done) => {
             Fetcher.text(url, networkOptions)
                 .then((text) => {
@@ -21,8 +22,7 @@ describe('Fetcher', function () {
                 .catch(done);
         });
         it('should fail [test checkResponse()]', (done) => {
-            const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-            'noFile.txt';
+            const url = `${itownsdataUrl}/noFile.txt`;
             let res;
             Fetcher.text(url, networkOptions)
                 .then((text) => {
@@ -42,8 +42,7 @@ describe('Fetcher', function () {
     });
 
     describe('json', function () {
-        const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-        'immersive/exampleParis1/cameraCalibration.json';
+        const url =  `${itownsdataUrl}/immersive/exampleParis1/cameraCalibration.json`;
         it('should load a json file', (done) => {
             Fetcher.json(url, networkOptions)
                 .then((json) => {
@@ -56,8 +55,7 @@ describe('Fetcher', function () {
     });
 
     describe('xml', function () {
-        const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-        'ULTRA2009.gpx';
+        const url =  `${itownsdataUrl}/ULTRA2009.gpx`;
         it('should load a xml file', (done) => {
             Fetcher.xml(url, networkOptions)
                 .then((xml) => {
@@ -87,8 +85,7 @@ describe('Fetcher', function () {
     });
 
     describe('arrayBuffer', function () {
-        const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-        'altitude-conversion-grids/RAF20_float.gtx';
+        const url =  `${itownsdataUrl}/altitude-conversion-grids/RAF20_float.gtx`;
         it('should load a json file', (done) => {
             Fetcher.arrayBuffer(url, networkOptions)
                 .then((buffer) => {
@@ -126,8 +123,7 @@ describe('Fetcher', function () {
     });
 
     describe('multiple', function () {
-        const url = 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
-        'vrt/velib-disponibilite-en-temps-reel';
+        const url =  `${itownsdataUrl}/vrt/velib-disponibilite-en-temps-reel`;
         const extension = {
             xml: ['vrt'],
             text: ['csv'],