test: reads('task.last.value') tracked prop interop

.travis.yml

@@ -32,6 +32,7 @@ env:
     - EMBER_TRY_SCENARIO=ember-beta
     - EMBER_TRY_SCENARIO=ember-canary
     - EMBER_TRY_SCENARIO=ember-canary-dev-browser
+    - EMBER_TRY_SCENARIO=ember-canary-tracked-properties
     - EMBER_TRY_SCENARIO=ember-default
 
 matrix:

config/ember-try.js

@@ -104,6 +104,17 @@ module.exports = function() {
             }
           }
         },
+        {
+          name: 'ember-canary-tracked-properties',
+          npm: {
+            devDependencies: {
+              'ember-source': urls[2]
+            }
+          },
+          env: {
+            EMBER_METAL_TRACKED_PROPERTIES: true
+          }
+        },
         {
           name: 'ember-default',
           npm: {

tests/dummy/config/environment.js

@@ -8,8 +8,9 @@ module.exports = function(environment) {
     locationType: 'auto',
     EmberENV: {
       FEATURES: {
-        // Here you can enable experimental features on an ember canary build
-        // e.g. 'with-controller': true
+        EMBER_METAL_TRACKED_PROPERTIES: Boolean(
+          process.env.EMBER_METAL_TRACKED_PROPERTIES
+        )
       },
       EXTEND_PROTOTYPES: {
         // Prevent Ember Data from overriding Date.parse.

tests/integration/reads-last-value-test.js

@@ -0,0 +1,45 @@
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'ember-qunit';
+import { render, settled } from '@ember/test-helpers';
+import hbs from 'htmlbars-inline-precompile';
+import { waitForQueue, task } from 'ember-concurrency';
+import EmberObject from '@ember/object';
+import { reads } from '@ember/object/computed';
+
+module("Integration | reads('task.last.value')", function(hooks) {
+  setupRenderingTest(hooks);
+
+  test('Ember Object Model', async function(assert) {
+    this.subject = EmberObject.extend({
+      task: task(function*() {
+        yield waitForQueue('afterRender');
+        return 1337;
+      }),
+
+      otherTask: task(function*() {
+        yield waitForQueue('afterRender');
+        return 1337;
+      }),
+
+      lastValue: reads('task.last.value')
+    }).create();
+
+    await render(
+      hbs`reads: {{this.subject.lastValue}}; direct: {{this.subject.task.last.value}};`
+    );
+
+    assert.strictEqual(this.element.textContent.trim(), 'reads: ; direct: ;');
+
+    this.subject.otherTask.perform(); // toggle this line
+    this.subject.task.perform();
+
+    await settled();
+
+    assert.strictEqual(this.subject.task.last.value, 1337);
+    assert.strictEqual(this.subject.lastValue, 1337);
+    assert.strictEqual(
+      this.element.textContent.trim(),
+      'reads: 1337; direct: 1337;'
+    );
+  });
+});