Check in codegen test expectations.

test/codegen/expect/language/mixin_getter_regression_test.js

Index: test/codegen/expect/language/mixin_getter_regression_test.js
diff --git a/test/codegen/expect/language/mixin_getter_regression_test.js b/test/codegen/expect/language/mixin_getter_regression_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..e161a54b179996600a10a7a1b24a47337b9eae2e
--- /dev/null
+++ b/test/codegen/expect/language/mixin_getter_regression_test.js
@@ -0,0 +1,42 @@
+dart_library.library('language/mixin_getter_regression_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__mixin_getter_regression_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 mixin_getter_regression_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  mixin_getter_regression_test.C = class C extends core.Object {
+    new() {
+      this.x = null;
+    }
+    get y() {
+      return this.x;
+    }
+  };
+  mixin_getter_regression_test.E = class E extends core.Object {
+    new() {
+      this.z = 10;
+    }
+  };
+  mixin_getter_regression_test.D = class D extends dart.mixin(mixin_getter_regression_test.E, mixin_getter_regression_test.C) {
+    new() {
+      this.w = 42;
+      super.new();
+    }
+  };
+  mixin_getter_regression_test.main = function() {
+    let d = new mixin_getter_regression_test.D();
+    d.x = 37;
+    expect$.Expect.equals(37, d.x);
+    expect$.Expect.equals(10, d.z);
+    expect$.Expect.equals(42, d.w);
+    expect$.Expect.equals(37, d.y);
+  };
+  dart.fn(mixin_getter_regression_test.main, VoidTodynamic());
+  // Exports:
+  exports.mixin_getter_regression_test = mixin_getter_regression_test;
+});