Check in codegen test expectations.

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

Index: test/codegen/expect/lib/html/worker_test.js
diff --git a/test/codegen/expect/lib/html/worker_test.js b/test/codegen/expect/lib/html/worker_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..bcbcef1c839aadf4951b28a742091261ead20721
--- /dev/null
+++ b/test/codegen/expect/lib/html/worker_test.js
@@ -0,0 +1,60 @@
+dart_library.library('lib/html/worker_test', null, /* Imports */[
+  'dart_sdk',
+  'unittest'
+], function load__worker_test(exports, dart_sdk, unittest) {
+  'use strict';
+  const core = dart_sdk.core;
+  const html = dart_sdk.html;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const html_individual_config = unittest.html_individual_config;
+  const unittest$ = unittest.unittest;
+  const src__matcher__expect = unittest.src__matcher__expect;
+  const src__matcher__core_matchers = unittest.src__matcher__core_matchers;
+  const src__matcher__throws_matcher = unittest.src__matcher__throws_matcher;
+  const worker_test = Object.create(null);
+  let EventTodynamic = () => (EventTodynamic = dart.constFn(dart.functionType(dart.dynamic, [html.Event])))();
+  let JSArrayOfString = () => (JSArrayOfString = dart.constFn(_interceptors.JSArray$(core.String)))();
+  let MessageEventTodynamic = () => (MessageEventTodynamic = dart.constFn(dart.functionType(dart.dynamic, [html.MessageEvent])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  let VoidToWorker = () => (VoidToWorker = dart.constFn(dart.definiteFunctionType(html.Worker, [])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  worker_test.main = function() {
+    html_individual_config.useHtmlIndividualConfiguration();
+    unittest$.group('supported', dart.fn(() => {
+      unittest$.test('supported', dart.fn(() => {
+        src__matcher__expect.expect(html.Worker[dartx.supported], src__matcher__core_matchers.isTrue);
+      }, VoidTodynamic()));
+    }, VoidTovoid()));
+    let workerScript = 'postMessage(\'WorkerMessage\');';
+    unittest$.group('functional', dart.fn(() => {
+      unittest$.test('unsupported', dart.fn(() => {
+        if (!dart.test(html.Worker[dartx.supported])) {
+          src__matcher__expect.expect(dart.fn(() => html.Worker.new('worker.js'), VoidToWorker()), src__matcher__throws_matcher.throws);
+        } else {
+          html.Worker.new('worker.js')[dartx.onError].first.then(dart.dynamic)(EventTodynamic()._check(unittest$.expectAsync(dart.fn(e => {
+            dart.dsend(e, 'preventDefault');
+            dart.dsend(e, 'stopImmediatePropagation');
+          }, dynamicTodynamic()))));
+        }
+      }, VoidTodynamic()));
+      if (!dart.test(html.Worker[dartx.supported])) {
+        return;
+      }
+      unittest$.test('works', dart.fn(() => {
+        let blob = html.Blob.new(JSArrayOfString().of([workerScript]), 'text/javascript');
+        let url = html.Url.createObjectUrl(blob);
+        let worker = html.Worker.new(url);
+        let test = unittest$.expectAsync(dart.fn(e => {
+          src__matcher__expect.expect(dart.dload(e, 'data'), 'WorkerMessage');
+        }, dynamicTodynamic()));
+        worker[dartx.onMessage].first.then(dart.dynamic)(MessageEventTodynamic()._check(test));
+      }, VoidTodynamic()));
+    }, VoidTovoid()));
+  };
+  dart.fn(worker_test.main, VoidTodynamic());
+  // Exports:
+  exports.worker_test = worker_test;
+});