Mock firebase.auth in config_test

Author: prakhar1989

javascript/widgets/config.js

@@ -298,8 +298,7 @@ firebaseui.auth.widget.Config.prototype.isDisplayNameRequired = function() {
   var signInOptions = this.getSignInOptions_();
 
   for (var i = 0; i < signInOptions.length; i++) {
-    //if (signInOptions[i]['provider'] == firebase.auth.EmailAuthProvider.PROVIDER_ID
-    if (signInOptions[i]['provider'] == 'password'
+    if (signInOptions[i]['provider'] == firebase.auth.EmailAuthProvider.PROVIDER_ID
         && signInOptions[i]['requireDisplayName'] !== undefined) {
       return /** @type {boolean} */ (!!signInOptions[i]['requireDisplayName']);
     }

javascript/widgets/config_test.js

@@ -41,6 +41,7 @@ goog.setTestOnly('firebaseui.auth.widget.ConfigTest');
 var config;
 var stub = new goog.testing.PropertyReplacer();
 var logMessages = [];
+var firebase = {};
 
 
 function setUp() {
@@ -50,6 +51,7 @@ function setUp() {
   stub.set(firebaseui.auth.log, 'error', function(msg) {
     logMessages.push(msg);
   });
+  firebase.auth = {EmailAuthProvider: {PROVIDER_ID: 'password'}};
 }