specify stateName value with a dash.

[et]

This is how I needed to register the state in order to get a simple test to run.

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

moduleFor('service:email-edit', 'EmailEditService', {
    needs: ['state:email-edit'],
});

// Replace this with your real tests.
test('it works', function(assert) {
    var service = this.subject();
    assert.ok(service);
});