fix various users-test.js

src/users.js

@@ -13,6 +13,7 @@ exports = module.exports = {
     get,
     getByResetToken,
     getByUsername,
+    getByEmail,
     getOwner,
     getAdmins,
     getSuperadmins,
@@ -240,7 +241,7 @@ async function add(email, data, auditSource) {
 
     eventlog.add(eventlog.ACTION_USER_ADD, auditSource, { userId: user.id, email: user.email, user: removePrivateFields(user) });
 
-    return user;
+    return user.id;
 }
 
 // returns true if ghost user was matched