Check in codegen test expectations.

test/codegen/expect/language/operator3_test.js

Index: test/codegen/expect/language/operator3_test.js
diff --git a/test/codegen/expect/language/operator3_test.js b/test/codegen/expect/language/operator3_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..2204e8bfcd7ad050090a5d3783a9a9bff71fd699
--- /dev/null
+++ b/test/codegen/expect/language/operator3_test.js
@@ -0,0 +1,40 @@
+dart_library.library('language/operator3_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__operator3_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 operator3_test = Object.create(null);
+  let dynamicTodynamic = () => (dynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  operator3_test.A = class A extends core.Object {
+    ['unary-']() {
+      return this;
+    }
+    toString() {
+      return "5";
+    }
+    abs() {
+      return "correct";
+    }
+  };
+  dart.setSignature(operator3_test.A, {
+    methods: () => ({
+      'unary-': dart.definiteFunctionType(dart.dynamic, []),
+      abs: dart.definiteFunctionType(dart.dynamic, [])
+    })
+  });
+  operator3_test.foo = function(a) {
+    return dart.dsend(dart.dsend(a, 'unary-'), 'unary-');
+  };
+  dart.fn(operator3_test.foo, dynamicTodynamic());
+  operator3_test.main = function() {
+    expect$.Expect.equals("correct", dart.dsend(operator3_test.foo(new operator3_test.A()), 'abs'));
+  };
+  dart.fn(operator3_test.main, VoidTodynamic());
+  // Exports:
+  exports.operator3_test = operator3_test;
+});