Check in codegen test expectations.

test/codegen/expect/lib/html/dart_object_local_storage_test.js

+dart_library.library('lib/html/dart_object_local_storage_test', null, /* Imports */[
+  'dart_sdk',
+  'unittest'
+], function load__dart_object_local_storage_test(exports, dart_sdk, unittest) {
+  'use strict';
+  const core = dart_sdk.core;
+  const html = dart_sdk.html;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const html_config = unittest.html_config;
+  const unittest$ = unittest.unittest;
+  const src__matcher__expect = unittest.src__matcher__expect;
+  const src__matcher__core_matchers = unittest.src__matcher__core_matchers;
+  const dart_object_local_storage_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  dart_object_local_storage_test.main = function() {
+    html_config.useHtmlConfiguration();
+    let body = html.document[dartx.body];
+    let localStorage = html.window[dartx.localStorage];
+    let sessionStorage = html.window[dartx.sessionStorage];
+    let element = html.Element.tag('canvas');
+    element[dartx.id] = 'test';
+    body[dartx.append](element);
+    unittest$.test('body', dart.fn(() => {
+      src__matcher__expect.expect(body, src__matcher__core_matchers.equals(html.document[dartx.body]));
+    }, VoidTodynamic()));
+    unittest$.test('localStorage', dart.fn(() => {
+      src__matcher__expect.expect(localStorage, src__matcher__core_matchers.equals(html.window[dartx.localStorage]));
+    }, VoidTodynamic()));
+    unittest$.test('sessionStorage', dart.fn(() => {
+      src__matcher__expect.expect(sessionStorage, src__matcher__core_matchers.equals(html.window[dartx.sessionStorage]));
+    }, VoidTodynamic()));
+    unittest$.test('unknown', dart.fn(() => {
+      let test = html.document[dartx.query]('#test');
+      src__matcher__expect.expect(element, src__matcher__core_matchers.equals(test));
+    }, VoidTodynamic()));
+  };
+  dart.fn(dart_object_local_storage_test.main, VoidTodynamic());
+  // Exports:
+  exports.dart_object_local_storage_test = dart_object_local_storage_test;
+});