Check in codegen test expectations.

test/codegen/expect/corelib/regress_11099_test.js

Index: test/codegen/expect/corelib/regress_11099_test.js
diff --git a/test/codegen/expect/corelib/regress_11099_test.js b/test/codegen/expect/corelib/regress_11099_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..39bdea57b11c4d23215c647b6533dd922d899d2b
--- /dev/null
+++ b/test/codegen/expect/corelib/regress_11099_test.js
@@ -0,0 +1,38 @@
+dart_library.library('corelib/regress_11099_test', null, /* Imports */[
+  'dart_sdk'
+], function load__regress_11099_test(exports, dart_sdk) {
+  'use strict';
+  const core = dart_sdk.core;
+  const _interceptors = dart_sdk._interceptors;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const regress_11099_test = Object.create(null);
+  let JSArrayOfMyTest = () => (JSArrayOfMyTest = dart.constFn(_interceptors.JSArray$(regress_11099_test.MyTest)))();
+  let ComparableOfMyTest = () => (ComparableOfMyTest = dart.constFn(core.Comparable$(regress_11099_test.MyTest)))();
+  let VoidTovoid = () => (VoidTovoid = dart.constFn(dart.definiteFunctionType(dart.void, [])))();
+  regress_11099_test.main = function() {
+    let l = JSArrayOfMyTest().of([new regress_11099_test.MyTest(1), new regress_11099_test.MyTest(5), new regress_11099_test.MyTest(3)]);
+    l[dartx.sort]();
+    if (dart.toString(l) != "[d{1}, d{3}, d{5}]") dart.throw('Wrong result!');
+  };
+  dart.fn(regress_11099_test.main, VoidTovoid());
+  regress_11099_test.MyTest = class MyTest extends core.Object {
+    new(a) {
+      this.a = a;
+    }
+    compareTo(b) {
+      return dart.notNull(this.a) - dart.notNull(b.a);
+    }
+    toString() {
+      return dart.str`d{${this.a}}`;
+    }
+  };
+  regress_11099_test.MyTest[dart.implements] = () => [ComparableOfMyTest()];
+  dart.setSignature(regress_11099_test.MyTest, {
+    constructors: () => ({new: dart.definiteFunctionType(regress_11099_test.MyTest, [core.int])}),
+    methods: () => ({compareTo: dart.definiteFunctionType(core.int, [regress_11099_test.MyTest])})
+  });
+  dart.defineExtensionMembers(regress_11099_test.MyTest, ['compareTo']);
+  // Exports:
+  exports.regress_11099_test = regress_11099_test;
+});