Why Ember-cli generates tests modules?

Testing
1

For example I have file app/acl.js

And when I compile my application

ember build

In my compiled file dist/assets/app.js i see two acl modules

define('builder/acl', ['exports', 'ember'], function (exports, Ember) {

and

define('builder/tests/acl', ['exports', 'ember'], function (exports, Ember) {

In the first builder/acl module code is transpiled from ES6 to ES5

But in the second module builder/tests/acl code is original ES6

And when I run tests

ember test --server

I got an error, because browsers doesn’t understand ES6 syntax.

How can I say ember-cli not to create second builder/tests/acl module?

Thanks!

2

Please help me!!! if someone knows what is the problem is.