Check in codegen test expectations.

test/codegen/expect/language/operator2_test.js

Index: test/codegen/expect/language/operator2_test.js
diff --git a/test/codegen/expect/language/operator2_test.js b/test/codegen/expect/language/operator2_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..b5e25bcc4a4b23e7c31f309e049e10092edaf8ca
--- /dev/null
+++ b/test/codegen/expect/language/operator2_test.js
@@ -0,0 +1,49 @@
+dart_library.library('language/operator2_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__operator2_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 operator2_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  operator2_test.Helper = class Helper extends core.Object {
+    new(val) {
+      this.i = val;
+    }
+    get(index) {
+      return dart.notNull(this.i) + dart.notNull(index);
+    }
+    set(index, val) {
+      this.i = val;
+      return val;
+    }
+  };
+  dart.setSignature(operator2_test.Helper, {
+    constructors: () => ({new: dart.definiteFunctionType(operator2_test.Helper, [core.int])}),
+    methods: () => ({
+      get: dart.definiteFunctionType(dart.dynamic, [core.int]),
+      set: dart.definiteFunctionType(dart.void, [core.int, core.int])
+    })
+  });
+  operator2_test.OperatorTest = class OperatorTest extends core.Object {
+    static testMain() {
+      let obj = new operator2_test.Helper(10);
+      expect$.Expect.equals(10, obj.i);
+      obj.set(10, 20);
+      expect$.Expect.equals(30, obj.get(10));
+    }
+  };
+  dart.setSignature(operator2_test.OperatorTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  operator2_test.main = function() {
+    operator2_test.OperatorTest.testMain();
+  };
+  dart.fn(operator2_test.main, VoidTodynamic());
+  // Exports:
+  exports.operator2_test = operator2_test;
+});