Don't download Chrome browsers on Mac since it is currently failing

Author: marco-c

test/helpers/download-test-browsers.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const os = require('os');
 const seleniumAssistant = require('selenium-assistant');
 
 const MAX_RETRIES = 3;
@@ -32,11 +33,20 @@ const promises = [
   downloadBrowser('firefox', 'stable'),
   downloadBrowser('firefox', 'beta'),
   downloadBrowser('firefox', 'unstable'),
-  downloadBrowser('chrome', 'stable'),
-  downloadBrowser('chrome', 'beta'),
-  downloadBrowser('chrome', 'unstable')
 ];
 
+// TODO: Temporarily disable downloading Chrome on Mac because of the following error on CI:
+// > Error: Command failed: hdiutil mount -nobrowse "/Users/runner/.selenium-assistant/google-chrome-unstable.dmg"
+// > hdiutil: mount failed - image not recognized
+if (os.platform() != 'darwin') {
+  promises = [
+    ...promises,
+    downloadBrowser('chrome', 'stable'),
+    downloadBrowser('chrome', 'beta'),
+    downloadBrowser('chrome', 'unstable')
+  ];
+}
+
 Promise.all(promises)
 .then(function() {
   console.log('Download complete.');