Add test

tests/unit/deprecated-registry-test.js

@@ -11,3 +11,27 @@ test('that Ember.ApplicationInstance.registry is correctly polyfilled', assert =
   assert.equal(typeof Ember.ApplicationInstance.prototype.registry, 'object', 'registry is present on Ember.ApplicationInstance');
 });
 
+test('properties (and aliases) are correctly assigned for accessing the container and registry', function(assert) {
+  assert.expect(6);
+  Ember.$('#qunit-fixture').html('<div id=\'one\'><div id=\'one-child\'>HI</div></div><div id=\'two\'>HI</div>');
+  let application = Ember.run(() => Ember.Application.create({ rootElement: '#one', router: null }));
+  let appInstance = Ember.run(() => Ember.ApplicationInstance.create({ application }));
+
+  assert.ok(appInstance, 'instance should be created');
+  assert.ok(appInstance.__container__, '#__container__ is accessible');
+  assert.ok(appInstance.__registry__, '#__registry__ is accessible');
+
+  // stub with a no-op to keep deprecation test simple
+  appInstance.__container__.lookup = function() {
+    assert.ok(true, '#loookup alias is called correctly');
+  };
+
+  assert.ok(typeof appInstance.registry.register === 'function', '#registry.register is available as a function');
+  appInstance.__registry__.register = function() {
+    assert.ok(true, '#register alias is called correctly');
+  };
+
+  assert.expectDeprecation(() => {
+    appInstance.registry.register();
+  }, /Using `ApplicationInstance.registry.register` is deprecated. Please use `ApplicationInstance.register` instead./);
+});