Check in codegen test expectations.

test/codegen/expect/language/issue9687_test.js

Index: test/codegen/expect/language/issue9687_test.js
diff --git a/test/codegen/expect/language/issue9687_test.js b/test/codegen/expect/language/issue9687_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..11e0e80d1de95dc9ef92a9c8db70359f4a94a07c
--- /dev/null
+++ b/test/codegen/expect/language/issue9687_test.js
@@ -0,0 +1,51 @@
+dart_library.library('language/issue9687_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__issue9687_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 issue9687_test = Object.create(null);
+  let JSArrayOfA = () => (JSArrayOfA = dart.constFn(_interceptors.JSArray$(issue9687_test.A)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  issue9687_test.A = class A extends core.Object {
+    new() {
+      this.finalField = 42;
+      this.otherFinalField = 54;
+    }
+    expectFinalField(arg1, arg2) {
+      expect$.Expect.equals(arg1, arg2);
+      expect$.Expect.equals(this.finalField, arg1);
+    }
+    expectOtherFinalField(_, arg1, arg2) {
+      expect$.Expect.equals(arg1, arg2);
+      expect$.Expect.equals(this.otherFinalField, arg1);
+    }
+  };
+  dart.setSignature(issue9687_test.A, {
+    constructors: () => ({new: dart.definiteFunctionType(issue9687_test.A, [])}),
+    methods: () => ({
+      expectFinalField: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic]),
+      expectOtherFinalField: dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic, dart.dynamic])
+    })
+  });
+  dart.defineLazy(issue9687_test, {
+    get array() {
+      return JSArrayOfA().of([new issue9687_test.A()]);
+    },
+    set array(_) {}
+  });
+  issue9687_test.main = function() {
+    let untypedReceiver = issue9687_test.array[dartx.get](0);
+    let typedReceiver = new issue9687_test.A();
+    let a = untypedReceiver.expectFinalField(typedReceiver.finalField, typedReceiver.finalField);
+    let b = core.int._check(a);
+    untypedReceiver.expectOtherFinalField(b, typedReceiver.otherFinalField, typedReceiver.otherFinalField);
+  };
+  dart.fn(issue9687_test.main, VoidTodynamic());
+  // Exports:
+  exports.issue9687_test = issue9687_test;
+});