Referencing a nested route using moduleFor in an ember test

Testing
1

i have a nested route which is defined in my router map as

Router.map(function() {
    this.resource('account', function () {
        this.route('sign-up');
    };
});

i want to refer to this sign-up route in my unit tests, but i keep getting a route undefined error. i am using q-unit provided by ember-cli. my test resides in

tests/unit/routes/account/sign-up-test.js

and the test looks like:

import { test, moduleFor } from 'ember-qunit';

moduleFor('route:account/sign-up', 'Account/signupRoute', {
});

test('it exists', function() {
    var route = this.subject();
    ok(route);
});

i keep getting this error when running tests:

Setup failed on it exists: Attempting to register an unknown factory: `route:account/sign-up`

anyone know how to refer to a nested route using moduleFor?