if ( Meteor.users.find().count() === 0 ) {

    var testUserDetails = {
      email: 'testEmail@gmail.com',
      password: 'testPassword'
    };
    console.log("Creating the Test User");
    var newUserId = Accounts.createUser(testUserDetails);

    Meteor.users.update(
      {_id: newUserId},
      { $set:
        {
          services : {
            google : {
              email : "testEmail@gmail.com"
            }
          }
        }
      }
    );

  } else {
    console.log("There are already users in the Test database");
  }

  console.log('***** Finished loading default fixtures *****');
},

{
    "_id" : "Dw2xQPDwKp58RozC4",
    "createdAt" : ISODate("2015-07-30T04:02:03.261Z"),
    "services" : {
        "password" : {
            "bcrypt" : "asdfasdfasdfdsafsadfasdsdsawf"
        },
        "resume" : {
            "loginTokens" : [ ]
        }
    },
    "emails" : [
        {
            "address" : "testEmail@gmail.com",
            "verified" : false
        }
    ]
}

var user = Meteor.users.findOne({
    _id: newUserId
});
var googleUserData = user.services.google;
googleUserData.email = "your_new_email@gmail.com";
Meteor.users.update({
    _id: newUserId
}, {
    $set: {
        services.google: {
            googleUserData
        }
    }
});