Bring back m2m test

addon/-private/relay.js

@@ -3,7 +3,6 @@
 import ObjectProxy from '@ember/object/proxy';
 import { get } from '@ember/object';
 import { assert } from '@ember/debug';
-import { isPresent } from '@ember/utils';
 import { RELAY } from 'ember-changeset/utils/is-relay';
 
 /*::
@@ -60,9 +59,9 @@ export default ObjectProxy.extend(({
     let r /*: RelayDef */ = this;
     r._super(...arguments);
     r._changedKeys = {};
-    assert('changeset must be present.', isPresent(get(this, 'changeset')));
-    assert('content must be present.', isPresent(get(this, 'content')));
-    assert('key must be present.', isPresent(get(this, 'key')));
+    assert('changeset must be present.', !!get(this, 'changeset'));
+    assert('content must be present.', !!get(this, 'content'));
+    assert('key must be present.', !!get(this, 'key'));
   },
 
   unknownProperty(key) {

addon/utils/is-relay.js

@@ -1,11 +1,10 @@
 // @flow
 
 import { get } from '@ember/object';
-import { isPresent } from '@ember/utils';
 
 export const RELAY = '__RELAY__';
 
 export default function isRelay(relay /*: mixed */) /*: boolean */ {
-  if (!isPresent(relay)) return false;
+  if (!relay) return false;
   return get(relay, '__relay__') === RELAY;
 }

tests/acceptance/main-test.js

@@ -1,4 +1,4 @@
-import { module, test, skip } from 'qunit';
+import { module, test } from 'qunit';
 import { setupApplicationTest } from 'ember-qunit';
 import { run } from '@ember/runloop';
 import Changeset from 'ember-changeset';
@@ -58,14 +58,14 @@ module('Acceptance | main', function(hooks) {
     })
   });
 
-  // skipping test for now
-  skip('it works for hasMany / firstObject', function(assert) {
+  test('it works for hasMany / firstObject', function(assert) {
     let user = this.dummyUser;
 
     let changeset = new Changeset(user);
     run(() => {
       let newDog = this.store.createRecord('dog', { breed: 'Münsterländer' });
-      changeset.get('dogs').pushObjects([newDog]);
+      let dogs = changeset.get('dogs');
+      dogs.pushObjects([newDog]);
     });
 
     let dogs = changeset.get('dogs').toArray();