Check in codegen test expectations.

test/codegen/expect/language/typed_selector_test.js

Index: test/codegen/expect/language/typed_selector_test.js
diff --git a/test/codegen/expect/language/typed_selector_test.js b/test/codegen/expect/language/typed_selector_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..235dd35a6a0160935514388bce4c7f3db8d77f4f
--- /dev/null
+++ b/test/codegen/expect/language/typed_selector_test.js
@@ -0,0 +1,37 @@
+dart_library.library('language/typed_selector_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__typed_selector_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const typed_selector_test = Object.create(null);
+  let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let intToint = () => (intToint = dart.constFn(dart.definiteFunctionType(core.int, [core.int])))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  typed_selector_test.A = class A extends core.Object {
+    get document() {
+      return 42;
+    }
+  };
+  typed_selector_test.B = class B extends core.Object {};
+  typed_selector_test.C = class C extends typed_selector_test.A {};
+  typed_selector_test.C[dart.implements] = () => [typed_selector_test.B];
+  typed_selector_test.inscrutable = function(x) {
+    return x == 0 ? 0 : (dart.notNull(x) | dart.notNull(typed_selector_test.inscrutable((dart.notNull(x) & dart.notNull(x) - 1) >>> 0))) >>> 0;
+  };
+  dart.fn(typed_selector_test.inscrutable, intToint());
+  typed_selector_test.main = function() {
+    let tab = JSArrayOfObject().of([new core.Object(), new typed_selector_test.C()]);
+    let obj = tab[dartx.get](typed_selector_test.inscrutable(1));
+    let res = 0;
+    if (typed_selector_test.B.is(obj)) res = core.int._check(obj.document);
+    expect$.Expect.equals(42, res);
+  };
+  dart.fn(typed_selector_test.main, VoidTovoid());
+  // Exports:
+  exports.typed_selector_test = typed_selector_test;
+});