Check in codegen test expectations.

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

Index: test/codegen/expect/lib/html/event_customevent_test.js
diff --git a/test/codegen/expect/lib/html/event_customevent_test.js b/test/codegen/expect/lib/html/event_customevent_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e74f0d739cc0e2265f84bea11c89c0de658fbc2d
--- /dev/null
+++ b/test/codegen/expect/lib/html/event_customevent_test.js
@@ -0,0 +1,82 @@
+dart_library.library('lib/html/event_customevent_test', null, /* Imports */[
+  'dart_sdk',
+  'unittest'
+], function load__event_customevent_test(exports, dart_sdk, unittest) {
+  'use strict';
+  const core = dart_sdk.core;
+  const html = dart_sdk.html;
+  const js = dart_sdk.js;
+  const async = dart_sdk.async;
+  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 event_customevent_test = Object.create(null);
+  let EventStreamProviderOfCustomEvent = () => (EventStreamProviderOfCustomEvent = dart.constFn(html.EventStreamProvider$(html.CustomEvent)))();
+  let CustomEventTovoid = () => (CustomEventTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [html.CustomEvent])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicTovoid = () => (dynamicTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [dart.dynamic])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidToFuture = () => (VoidToFuture = dart.constFn(dart.definiteFunctionType(async.Future, [])))();
+  event_customevent_test.DartPayloadData = class DartPayloadData extends core.Object {
+    new(dartValue) {
+      this.dartValue = dartValue;
+    }
+  };
+  dart.setSignature(event_customevent_test.DartPayloadData, {
+    constructors: () => ({new: dart.definiteFunctionType(event_customevent_test.DartPayloadData, [dart.dynamic])})
+  });
+  event_customevent_test.main = function() {
+    html_config.useHtmlConfiguration();
+    unittest$.test('custom events', dart.fn(() => {
+      let provider = new (EventStreamProviderOfCustomEvent())('foo');
+      let el = html.DivElement.new();
+      let fired = false;
+      provider.forTarget(el).listen(dart.fn(ev => {
+        fired = true;
+        src__matcher__expect.expect(ev[dartx.detail], dart.map({type: 'detail'}));
+      }, CustomEventTovoid()));
+      let ev = html.CustomEvent.new('foo', {canBubble: false, cancelable: false, detail: dart.map({type: 'detail'})});
+      el[dartx.dispatchEvent](ev);
+      src__matcher__expect.expect(fired, src__matcher__core_matchers.isTrue);
+    }, VoidTodynamic()));
+    unittest$.test('custom events from JS', dart.fn(() => {
+      let scriptContents = '      var event = document.createEvent("CustomEvent");\n      event.initCustomEvent("js_custom_event", true, true, {type: "detail"});\n      window.dispatchEvent(event);\n    ';
+      let fired = false;
+      html.window[dartx.on].get('js_custom_event').listen(dart.fn(ev => {
+        fired = true;
+        src__matcher__expect.expect(dart.dload(ev, 'detail'), dart.map({type: 'detail'}));
+      }, dynamicTovoid()));
+      let script = html.ScriptElement.new();
+      script[dartx.text] = scriptContents;
+      html.document[dartx.body][dartx.append](script);
+      src__matcher__expect.expect(fired, src__matcher__core_matchers.isTrue);
+    }, VoidTodynamic()));
+    unittest$.test('custom events to JS', dart.fn(() => {
+      src__matcher__expect.expect(js.context.get('gotDartEvent'), src__matcher__core_matchers.isNull);
+      let scriptContents = '      window.addEventListener(\'dart_custom_event\', function(e) {\n        if (e.detail == \'dart_message\') {\n          e.preventDefault();\n          window.gotDartEvent = true;\n        }\n        window.console.log(\'here\' + e.detail);\n      }, false);';
+      html.document[dartx.body][dartx.append]((() => {
+        let _ = html.ScriptElement.new();
+        _[dartx.text] = scriptContents;
+        return _;
+      })());
+      let event = html.CustomEvent.new('dart_custom_event', {detail: 'dart_message'});
+      html.window[dartx.dispatchEvent](event);
+      src__matcher__expect.expect(js.context.get('gotDartEvent'), src__matcher__core_matchers.isTrue);
+    }, VoidTodynamic()));
+    unittest$.test('custom data to Dart', dart.fn(() => {
+      let data = new event_customevent_test.DartPayloadData(666);
+      let event = html.CustomEvent.new('dart_custom_data_event', {detail: data});
+      let future = html.window[dartx.on].get('dart_custom_data_event').first.then(dart.dynamic)(dart.fn(_ => {
+        src__matcher__expect.expect(dart.dload(event[dartx.detail], 'dartValue'), 666);
+      }, dynamicTodynamic()));
+      html.document[dartx.body][dartx.dispatchEvent](event);
+      return future;
+    }, VoidToFuture()));
+  };
+  dart.fn(event_customevent_test.main, VoidTodynamic());
+  // Exports:
+  exports.event_customevent_test = event_customevent_test;
+});