move config creation into its own function

lib/event_hub_client.js

@@ -15,19 +15,12 @@ EventHubClient.fromConnectionString = function (connectionString, path, Type_) {
   if (!connectionString) {
     throw new ArgumentError('Missing argument connectionString');
   }
-
-  var cn = ConnectionString.parse(connectionString);
-  if (!cn.EntityPath && !path) {
+  
+  var config = makeConfig(connectionString, path);
+  if (!config.path) {
     throw new ArgumentError('Connection string doesn\'t have EntityPath, or missing argument path');
   }
-  
-  var endpoint = cn.Endpoint || ''; 
-  var host = (endpoint.match('sb://([^/]*)') || [])[1];
-  
-  var config = {
-    host: host
-  };
-  
+
   Type_ = Type_ || EventHubClient;
 
   return new Type_(config);
@@ -37,4 +30,14 @@ EventHubClient.prototype.open = function () {
   return Promise.resolve();
 };
 
+function makeConfig(connectionString, path) {
+  var cn = ConnectionString.parse(connectionString);
+  var endpoint = cn.Endpoint || ''; 
+  
+  return {
+    host: (endpoint.match('sb://([^/]*)') || [])[1],
+    path: cn.EntityPath || path
+  };
+}
+
 module.exports = EventHubClient;