add ember-data tests

package.json

@@ -38,6 +38,7 @@
     "ember-cli-sri": "^2.1.1",
     "ember-cli-template-lint": "^1.0.0-beta.1",
     "ember-cli-uglify": "^2.1.0",
+    "ember-data": "^3.9.0",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^1.1.0",

tests/unit/data-test.js

@@ -0,0 +1,61 @@
+import { module, test } from "qunit";
+import DS from "ember-data";
+import { getContext } from "@ember/test-helpers";
+import { setupApplicationTest } from "ember-qunit";
+
+function getService(name) {
+  return getContext().owner.lookup(`service:${name}`);
+}
+
+function register(registeredName, object) {
+  getContext().owner.register(registeredName, object);
+}
+
+function stubAdapter() {
+  let store = getService("store");
+  store.createRecord('post', { name: name1 });
+  store.createRecord('post', { name: name2 });
+}
+
+let name1 = "Rails is omakase";
+let name2 = "The Parley Letter";
+let expectedNames = [name1, name2].join();
+
+module("ember-data", function(hooks) {
+  setupApplicationTest(hooks);
+
+  test("attr", async function(assert) {
+    let Post = DS.Model.extend({ name: DS.attr() });
+    register(`model:post`, Post);
+    stubAdapter();
+
+    let store = getService("store");
+    let posts = await store.peekAll("post");
+    let names = posts.toArray().map(post => post.name).join();
+
+    assert.equal(
+      names,
+      expectedNames,
+      "The correct records are in the array"
+    );
+  });
+
+  test("@attr", async function(assert) {
+    let Post = class extends DS.Model {
+      @DS.attr() name;
+    }
+
+    register(`model:post`, Post);
+    stubAdapter();
+
+    let store = getService("store");
+    let posts = await store.peekAll("post");
+    let names = posts.toArray().map(post => post.name).join();
+
+    assert.equal(
+      names,
+      expectedNames,
+      "The correct records are in the array"
+    );
+  });
+});