diff --git a/bin/testrunner.js b/bin/testrunner.js
index fe19610..9e091f3 100644
--- a/bin/testrunner.js
+++ b/bin/testrunner.js
@@ -1,9 +1,9 @@
 /**
- * 
- * make screenshots and log errors to 
+ *
+ * make screenshots and log errors to
  * console
  * (c) 2019 - Leibniz-Insitut für Wissensmedien
- * 
+ *
  */
 
 const puppeteer = require('puppeteer');
@@ -24,13 +24,13 @@ function logPageEvent(event){
 }
 
 async function makeScreenshot(href){
-    
+
     const browser = await puppeteer.launch({args: [
         '–allow-file-access-from-files',
       ],});
 
     const page = await browser.newPage();
-    
+
     await page.setViewport({width: 1024,height : 624})
 
     // register events
@@ -53,9 +53,9 @@ async function makeScreenshot(href){
     }
     // image_url = image_url.replace("file:///","")
     // fpath = fpath.replace("file:///","")
-    
+
     page.removeAllListeners()
-    
+
     fs.ensureDir(fpath)
 
     await page.screenshot({path: image_url});
@@ -63,10 +63,10 @@ async function makeScreenshot(href){
 }
 
 /**
- * 
+ *
  * collect all navigational links in all documents
- *  
- * */ 
+ *
+ * */
 
 async function collectLinks(href,reflist)
 {
@@ -76,12 +76,12 @@ async function collectLinks(href,reflist)
 
     await page.goto(href)
     let hrefs = await page.$$('a.wrapper')
-    
+
     for (var i=0; i < hrefs.length; i++) {
         let hrefValue = await hrefs[i].getProperty('href')
         let linkText = await hrefValue.jsonValue();
         if (!linkText.startsWith("file:"))
-        { 
+        {
             continue;
         }
         if(linkText.endsWith("#")) continue;
@@ -113,4 +113,4 @@ async function collectLinks(href,reflist)
         await makeScreenshot(reflist[i])
         console.log(i,reflist[i])
     }
-})()
\ No newline at end of file
+})()