Check in codegen test expectations.

test/codegen/expect/language/allocate_test.js

+dart_library.library('language/allocate_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__allocate_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 allocate_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  allocate_test.MyAllocate = class MyAllocate extends core.Object {
+    new(value) {
+      if (value === void 0) value = 0;
+      this.value_ = value;
+    }
+    getValue() {
+      return this.value_;
+    }
+  };
+  dart.setSignature(allocate_test.MyAllocate, {
+    constructors: () => ({new: dart.definiteFunctionType(allocate_test.MyAllocate, [], [core.int])}),
+    methods: () => ({getValue: dart.definiteFunctionType(core.int, [])})
+  });
+  allocate_test.AllocateTest = class AllocateTest extends core.Object {
+    static testMain() {
+      expect$.Expect.equals(900, new allocate_test.MyAllocate(900).getValue());
+    }
+  };
+  dart.setSignature(allocate_test.AllocateTest, {
+    statics: () => ({testMain: dart.definiteFunctionType(dart.dynamic, [])}),
+    names: ['testMain']
+  });
+  allocate_test.main = function() {
+    allocate_test.AllocateTest.testMain();
+  };
+  dart.fn(allocate_test.main, VoidTodynamic());
+  // Exports:
+  exports.allocate_test = allocate_test;
+});