Failing test

tests/integration/mixins/loadable-store/load-records-test.js

@@ -4,6 +4,7 @@ import { waitUntil } from '@ember/test-helpers';
 import MirageServer from 'dummy/tests/integration/helpers/mirage-server';
 import { Model, hasMany, belongsTo } from 'ember-cli-mirage';
 import LoadableStore from 'ember-data-storefront/mixins/loadable-store';
+import DSModel from 'ember-data/model';
 
 module('Integration | Mixins | LoadableStore | loadRecords', function(hooks) {
   setupTest(hooks);
@@ -146,6 +147,27 @@ module('Integration | Mixins | LoadableStore | loadRecords', function(hooks) {
     assert.equal(posts.get('firstObject.comments.length'), 2);
   });
 
+  test('it can load a polymorphic collection with model-specific includes', async function(assert) {
+    server.logging = true;
+    this.server.get('/items', schema => {
+      let posts = schema.posts.all();
+      let comments = schema.comments.all();
+
+      return posts.mergeCollection(comments);
+    });
+    let post = this.server.create('post');
+    let comment = this.server.create('comment');
+    this.owner.register('model:item', DSModel.extend());
+
+    await this.store.loadRecords('item', {
+      // Only Posts have tags
+      include: 'tags'
+    });
+
+    assert.ok(this.store.peekRecord('post', post.id));
+    assert.ok(this.store.peekRecord('comment', comment.id));
+  });
+
   module('Tracking includes', function() {
     test('it will track an include', async function(assert) {
       let serverPost = this.server.create('post', { title: 'My post' });