Ember.js Acceptance test not working if ember server not run

I'm trying to run ember test, when the ember server is running, everything is OK all my test pass ! When I don't execute ember server before (which is the case in my GitLab integration), I have one test which fail :

import { test } from 'qunit';
import moduleForAcceptance from 'emberjs-poc/tests/helpers/module-for-acceptance';

moduleForAcceptance('Acceptance | list rates');

test('visiting /rates', function(assert) {
  visit('/rates');

  andThen(function() {
    assert.equal(currentURL(), '/rates');
  });
});

I don't really understand why because in the moduleForAcceptance function we should run the app before each test. I've this error for information :

Log: |
            { type: 'error',
              text: '\'Error while processing route: rates\' \'The adapter operation was aborted\'\n' }
            { type: 'error', text: 'null\n' }