Use constants.TEST

src/mailer.js

@@ -18,6 +18,7 @@ exports = module.exports = {
 const assert = require('assert'),
     BoxError = require('./boxerror.js'),
     branding = require('./branding.js'),
+    constants = require('./constants.js'),
     dashboard = require('./dashboard.js'),
     debug = require('debug')('box:mailer'),
     ejs = require('ejs'),
@@ -47,7 +48,7 @@ async function getMailConfig() {
 async function sendMail(mailOptions) {
     assert.strictEqual(typeof mailOptions, 'object');
 
-    if (process.env.BOX_ENV === 'test') {
+    if (constants.TEST) {
         exports._mailQueue.push(mailOptions);
         return;
     }