diff --git a/test/karma.conf.js b/test/karma.conf.js
index 23130246..576787a8 100644
--- a/test/karma.conf.js
+++ b/test/karma.conf.js
@@ -9,6 +9,7 @@
 'use strict';
 
 const os = require('os');
+const path = require('path');
 const puppeteerBrowsers = require('@puppeteer/browsers');
 
 async function download(browser, version, cacheDir, platform) {
@@ -20,11 +21,12 @@ async function download(browser, version, cacheDir, platform) {
     cacheDir,
     platform
   });
+  console.error(browser, version, platform, buildId);
   return buildId;
 }
 
 module.exports = async(config) => {
-  const cacheDir = process.cwd() + '/browsers';
+  const cacheDir = path.join(process.cwd(), 'browsers');
   const platform = puppeteerBrowsers.detectBrowserPlatform();
 
   let browsers;
@@ -43,6 +45,8 @@ module.exports = async(config) => {
   } else {
     browsers = ['chrome', 'firefox'];
   }
+  console.error('BROWSERS', browsers);
+  console.error('HRM1', browsers.includes('chrome'), process.env.CHROME_BIN);
 
   let reporters = ['mocha'];
   if (process.env.CI) {
@@ -64,11 +68,14 @@ module.exports = async(config) => {
     process.env.FIREFOX_BIN = puppeteerBrowsers
       .computeExecutablePath({browser: 'firefox', buildId, cacheDir, platform});
   }
+  console.error('HRM', browsers.includes('chrome'), process.env.CHROME_BIN);
   if (browsers.includes('chrome') && !process.env.CHROME_BIN) {
+    console.log('starting chrome download');
     const buildId = await download('chrome', process.env.BVER || 'stable',
       cacheDir, platform);
     process.env.CHROME_BIN = puppeteerBrowsers
       .computeExecutablePath({browser: 'chrome', buildId, cacheDir, platform});
+    console.log('done with chrome download', process.env.CHROME_BIN);
   }
 
   let chromeFlags = [