adds test that ensure removed linked auth are actually deleted from document

spec/OAuth.spec.js

@@ -1,5 +1,6 @@
 var OAuth = require("../src/authDataManager/OAuth1Client");
 var request = require('request');
+var Config = require("../src/Config");
 
 describe('OAuth', function() {
 
@@ -266,12 +267,21 @@ describe('OAuth', function() {
 
         model._unlinkFrom("myoauth", {
           success: function(model) {
+
             ok(!model._isLinked("myoauth"),
                "User should not be linked to myoauth");
             ok(!provider.synchronizedUserId, "User id should be cleared");
             ok(!provider.synchronizedAuthToken, "Auth token should be cleared");
             ok(!provider.synchronizedExpiration,
                "Expiration should be cleared");
+            // make sure the auth data is properly deleted
+            var config = new Config(Parse.applicationId);
+            config.database.mongoFind('_User', {
+              _id: model.id
+            }).then((res) => {
+              expect(res.length).toBe(1);
+              expect(res[0]._auth_data_myoauth).toBeUndefined();
+              expect(res[0]._auth_data_myoauth).not.toBeNull();
 
               model._linkWith("myoauth", {
                 success: function(model) {
@@ -289,6 +299,7 @@ describe('OAuth', function() {
                   done();
                 }
               });
+            });
           },
           error: function(model, error) {
             ok(false, "unlinking should succeed");