Add test for when an array is returned

packages/ember-data/tests/integration/adapter/rest-adapter-test.js

@@ -1181,6 +1181,19 @@ test("queryRecord - returning sideloaded data loads the data", function() {
   }));
 });
 
+test("queryRecord - returning an array picks the first one but saves all records to the store", function() {
+  ajaxResponse({
+    post: [{ id: 1, name: "Rails is omakase" }, { id: 2, name: "Ember is js" }]
+  });
+
+  store.queryRecord('post', { slug: 'rails-is-omakaze' }).then(async(function(post) {
+    var post2 = store.peekRecord('post', 2);
+
+    deepEqual(post.getProperties('id', 'name'), { id: "1", name: "Rails is omakase" });
+    deepEqual(post2.getProperties('id', 'name'), { id: "2", name: "Ember is js" });
+  }));
+});
+
 test("queryRecord - data is normalized through custom serializers", function() {
   env.registry.register('serializer:post', DS.RESTSerializer.extend({
     primaryKey: '_ID_',