test: use path.join to join path to browser

Author: fippo

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 +45,7 @@ module.exports = async(config) => {
   } else {
     browsers = ['chrome', 'firefox'];
   }
+  console.error('BROWSERS', browser);
 
   let reporters = ['mocha'];
   if (process.env.CI) {