Check in codegen test expectations.

test/codegen/expect/language/mixin_issue10216_2_test.js

Index: test/codegen/expect/language/mixin_issue10216_2_test.js
diff --git a/test/codegen/expect/language/mixin_issue10216_2_test.js b/test/codegen/expect/language/mixin_issue10216_2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..2abb9a2e827fbaefb04c95a6fd236800500d550e
--- /dev/null
+++ b/test/codegen/expect/language/mixin_issue10216_2_test.js
@@ -0,0 +1,34 @@
+dart_library.library('language/mixin_issue10216_2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__mixin_issue10216_2_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 mixin_issue10216_2_test = Object.create(null);
+  let JSArrayOfObject = () => (JSArrayOfObject = dart.constFn(_interceptors.JSArray$(core.Object)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  mixin_issue10216_2_test.M0 = class M0 extends core.Object {
+    foo() {
+      return 42;
+    }
+  };
+  dart.setSignature(mixin_issue10216_2_test.M0, {
+    methods: () => ({foo: dart.definiteFunctionType(dart.dynamic, [])})
+  });
+  mixin_issue10216_2_test.M1 = class M1 extends dart.mixin(core.Object, mixin_issue10216_2_test.M0) {};
+  mixin_issue10216_2_test.M2 = class M2 extends dart.mixin(core.Object, mixin_issue10216_2_test.M1) {};
+  mixin_issue10216_2_test.makeM2 = function() {
+    return mixin_issue10216_2_test.M2.as(JSArrayOfObject().of([new core.Object(), new mixin_issue10216_2_test.M2()])[dartx.last]);
+  };
+  dart.fn(mixin_issue10216_2_test.makeM2, VoidTodynamic());
+  mixin_issue10216_2_test.main = function() {
+    expect$.Expect.equals(42, dart.dsend(mixin_issue10216_2_test.makeM2(), 'foo'));
+  };
+  dart.fn(mixin_issue10216_2_test.main, VoidTodynamic());
+  // Exports:
+  exports.mixin_issue10216_2_test = mixin_issue10216_2_test;
+});