Index: test/browsers/chromium.js
===================================================================
--- a/test/browsers/chromium.js
+++ b/test/browsers/chromium.js
@@ -39,10 +39,12 @@
 exports.getDriver = function(browserBinary, devenvPath)
 {
   let options = new chrome.Options()
-    .setChromeBinaryPath(browserBinary)
     .addArguments("--no-sandbox")
     .addArguments(`load-extension=${devenvPath}`);
 
+  if (browserBinary != null)
+    options.setChromeBinaryPath(browserBinary);
+
   return new webdriver.Builder()
     .forBrowser("chrome")
     .setChromeOptions(options)