Check in codegen test expectations.

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

+dart_library.library('lib/html/wheelevent_test', null, /* Imports */[
+  'dart_sdk',
+  'unittest'
+], function load__wheelevent_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 wheelevent_test = Object.create(null);
+  let WheelEventTovoid = () => (WheelEventTovoid = dart.constFn(dart.functionType(dart.void, [html.WheelEvent])))();
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  wheelevent_test.main = function() {
+    html_config.useHtmlConfiguration();
+    unittest$.test('wheelEvent', dart.fn(() => {
+      let element = html.DivElement.new();
+      let eventType = html.Element.mouseWheelEvent.getEventType(element);
+      element[dartx.onMouseWheel].listen(WheelEventTovoid()._check(unittest$.expectAsync(dart.fn(e => {
+        src__matcher__expect.expect(dart.dload(dart.dload(e, 'screen'), 'x'), 100);
+        src__matcher__expect.expect(dart.dload(e, 'deltaX'), 0);
+        src__matcher__expect.expect(dart.dsend(dart.dload(e, 'deltaY'), 'toDouble'), 240.0);
+        src__matcher__expect.expect(dart.dload(e, 'deltaMode'), html.WheelEvent.DOM_DELTA_PAGE);
+      }, dynamicTodynamic()))));
+      let event = html.WheelEvent.new(eventType, {deltaX: 0, deltaY: 240, deltaMode: html.WheelEvent.DOM_DELTA_PAGE, screenX: 100});
+      element[dartx.dispatchEvent](event);
+    }, VoidTodynamic()));
+    unittest$.test('wheelEvent with deltaZ', dart.fn(() => {
+      let element = html.DivElement.new();
+      let eventType = html.Element.mouseWheelEvent.getEventType(element);
+      element[dartx.onMouseWheel].listen(WheelEventTovoid()._check(unittest$.expectAsync(dart.fn(e => {
+        src__matcher__expect.expect(dart.dload(e, 'deltaX'), 0);
+        src__matcher__expect.expect(dart.dload(e, 'deltaY'), 0);
+        src__matcher__expect.expect(dart.dload(dart.dload(e, 'screen'), 'x'), 0);
+        src__matcher__expect.expect(dart.dsend(dart.dload(e, 'deltaZ'), 'toDouble'), 1.0);
+      }, dynamicTodynamic()))));
+      let event = html.WheelEvent.new(eventType, {deltaZ: 1.0});
+      element[dartx.dispatchEvent](event);
+    }, VoidTodynamic()));
+    unittest$.test('wheelEvent Stream', dart.fn(() => {
+      let element = html.DivElement.new();
+      let eventType = html.Element.mouseWheelEvent.getEventType(element);
+      element[dartx.onMouseWheel].listen(WheelEventTovoid()._check(unittest$.expectAsync(dart.fn(e => {
+        src__matcher__expect.expect(dart.dload(dart.dload(e, 'screen'), 'x'), 100);
+        src__matcher__expect.expect(dart.dsend(dart.dload(e, 'deltaX'), 'toDouble'), 240.0);
+        src__matcher__expect.expect(dart.dload(e, 'deltaY'), 0);
+      }, dynamicTodynamic()))));
+      let event = html.WheelEvent.new(eventType, {deltaX: 240, deltaY: 0, screenX: 100});
+      element[dartx.dispatchEvent](event);
+    }, VoidTodynamic()));
+  };
+  dart.fn(wheelevent_test.main, VoidTodynamic());
+  // Exports:
+  exports.wheelevent_test = wheelevent_test;
+});