fix tests

apps/block_scout_web/assets/js/socket.js

@@ -1,7 +1,7 @@
 import { Socket } from 'phoenix'
 import { locale } from './locale'
 
-const socket = new Socket(process.env.SOCKET_ROOT + '/socket', { params: { locale: locale } })
+const socket = new Socket((process.env.SOCKET_ROOT || '') + '/socket', { params: { locale: locale } })
 socket.connect()
 
 export default socket

apps/block_scout_web/assets/webpack.config.js

@@ -139,7 +139,7 @@ const appJs =
       new CopyWebpackPlugin([{ from: 'static/', to: '../' }]),
       new ContextReplacementPlugin(/moment[\/\\]locale$/, /en/),
       new webpack.DefinePlugin({
-        'process.env.SOCKET_ROOT': JSON.stringify(process.env.SOCKET_ROOT || '')
+        'process.env.SOCKET_ROOT': JSON.stringify(process.env.SOCKET_ROOT)
       })
     ]
   }