make users-test work

src/test/common.js

@@ -6,7 +6,9 @@ const appdb = require('../appdb.js'),
     blobs = require('../blobs.js'),
     constants = require('../constants.js'),
     database = require('../database.js'),
+    delay = require('delay'),
     domains = require('../domains.js'),
+    expect = require('expect.js'),
     fs = require('fs'),
     mail = require('../mail.js'),
     mailboxdb = require('../mailboxdb.js'),
@@ -116,6 +118,8 @@ exports = module.exports = {
     domainSetup,
     setup,
     cleanup,
+    checkMails,
+    clearMailQueue,
 
     mockApiServerOrigin: 'http://localhost:6060',
     DASHBOARD_DOMAIN: 'test.example.com',
@@ -201,3 +205,12 @@ function cleanup(done) {
     ], done);
 }
 
+function clearMailQueue() {
+    mailer._mailQueue = [];
+}
+
+async function checkMails(number) {
+    await delay(1000);
+    expect(mailer._mailQueue.length).to.equal(number);
+    clearMailQueue();
+}