Check in codegen test expectations.

test/codegen/expect/language/js_properties_test.js

Index: test/codegen/expect/language/js_properties_test.js
diff --git a/test/codegen/expect/language/js_properties_test.js b/test/codegen/expect/language/js_properties_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..3b08f6dde6de75ad1f17abbfa0f7e1009e58eb56
--- /dev/null
+++ b/test/codegen/expect/language/js_properties_test.js
@@ -0,0 +1,47 @@
+dart_library.library('language/js_properties_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__js_properties_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const js_properties_test = Object.create(null);
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  js_properties_test.main = function() {
+    expect$.Expect.equals(42, new js_properties_test.__defineGetter__().hello());
+    expect$.Expect.equals(42, new js_properties_test.__defineSetter__().hello());
+    expect$.Expect.equals(42, new js_properties_test.__lookupGetter__().hello());
+    expect$.Expect.equals(42, new js_properties_test.__lookupSetter__().hello());
+    expect$.Expect.equals(42, new js_properties_test.constructor().hello());
+    expect$.Expect.equals(42, new js_properties_test.hasOwnProperty().hello());
+    expect$.Expect.equals(42, new js_properties_test.isPrototypeOf().hello());
+    expect$.Expect.equals(42, new js_properties_test.propertyIsEnumerable().hello());
+    expect$.Expect.equals(42, new js_properties_test.toLocaleString().hello());
+    expect$.Expect.equals(42, new js_properties_test.toString().hello());
+    expect$.Expect.equals(42, new js_properties_test.valueOf().hello());
+  };
+  dart.fn(js_properties_test.main, VoidTovoid());
+  js_properties_test.Hello = class Hello extends core.Object {
+    hello() {
+      return 42;
+    }
+  };
+  dart.setSignature(js_properties_test.Hello, {
+    methods: () => ({hello: dart.definiteFunctionType(core.int, [])})
+  });
+  js_properties_test.__defineGetter__ = class __defineGetter__ extends js_properties_test.Hello {};
+  js_properties_test.__defineSetter__ = class __defineSetter__ extends js_properties_test.Hello {};
+  js_properties_test.__lookupGetter__ = class __lookupGetter__ extends js_properties_test.Hello {};
+  js_properties_test.__lookupSetter__ = class __lookupSetter__ extends js_properties_test.Hello {};
+  js_properties_test.constructor = class constructor extends js_properties_test.Hello {};
+  js_properties_test.hasOwnProperty = class hasOwnProperty extends js_properties_test.Hello {};
+  js_properties_test.isPrototypeOf = class isPrototypeOf extends js_properties_test.Hello {};
+  js_properties_test.propertyIsEnumerable = class propertyIsEnumerable extends js_properties_test.Hello {};
+  js_properties_test.toLocaleString = class toLocaleString extends js_properties_test.Hello {};
+  js_properties_test.toString = class toString extends js_properties_test.Hello {};
+  js_properties_test.valueOf = class valueOf extends js_properties_test.Hello {};
+  // Exports:
+  exports.js_properties_test = js_properties_test;
+});