Unknown `service:session` injector in Ember route unit test

I have simple sign in route in my Ember app:

import Ember from 'ember';
import UnauthenticatedRouteMixin from 'ember-simple-auth/mixins/unauthenticated-route-mixin';

export default Ember.Route.extend(UnauthenticatedRouteMixin, {
});

And not much more complicated unit test for that:

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

moduleFor('route:sign-in', 'Unit | Route | sign in', {
  needs: ['service:session']
});

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

But when running ember test -f sign it fails with error telling me that it cannot inject service:session:

Built project successfully. Stored in "/Users/hauleth/Workspace/hauleth/crossover/frontend/tmp/core_object-tests_dist-P16KQenq.tmp".
not ok 1 PhantomJS 2.1 - Unit | Controller | sign in: it exists
    ---
        actual: >
            null
        stack: >
            validateInjections@http://localhost:7357/assets/vendor.js:12932:91
            http://localhost:7357/assets/vendor.js:12107:48
            runInDebug@http://localhost:7357/assets/vendor.js:17219:9
            runInDebug@http://localhost:7357/assets/vendor.js:26382:43
            instantiate@http://localhost:7357/assets/vendor.js:12101:34
            lookup@http://localhost:7357/assets/vendor.js:11955:28
            buildInjections@http://localhost:7357/assets/vendor.js:11994:42
            injectionsFor@http://localhost:7357/assets/vendor.js:12067:37
            factoryFor@http://localhost:7357/assets/vendor.js:12038:37
            lookupFactory@http://localhost:7357/assets/vendor.js:11888:24
            factory@http://localhost:7357/assets/test-support.js:7816:39
            http://localhost:7357/assets/test-support.js:7904:75
            http://localhost:7357/assets/tests.js:345:34
            wrapper@http://localhost:7357/assets/test-support.js:6634:34
            runTest@http://localhost:7357/assets/test-support.js:2779:32
            run@http://localhost:7357/assets/test-support.js:2764:11
            http://localhost:7357/assets/test-support.js:2906:14
            process@http://localhost:7357/assets/test-support.js:2565:24
            begin@http://localhost:7357/assets/test-support.js:2547:9
            http://localhost:7357/assets/test-support.js:2607:9
        message: >
            Died on test #1 testWrapper@http://localhost:7357/assets/test-support.js:6663:16
            test@http://localhost:7357/assets/test-support.js:6676:44
            http://localhost:7357/assets/tests.js:344:24
            exports@http://localhost:7357/assets/vendor.js:131:37
            requireModule@http://localhost:7357/assets/vendor.js:30:25
            require@http://localhost:7357/assets/test-loader.js:67:16
            loadModules@http://localhost:7357/assets/test-loader.js:58:25
            load@http://localhost:7357/assets/test-loader.js:89:35
            http://localhost:7357/assets/test-support.js:6485:20: Attempting to inject an unknown injection: `service:session`
        Log: |
    ...
ok 2 PhantomJS 2.1 - Unit | Route | sign in: it exists

1..2
# tests 2
# pass  1
# skip  0
# fail  1

I tried to find solutions but everything I find is about integration testing or tells me to add needs: ['service:session'], but it already is there.