Check in codegen test expectations.

test/codegen/expect/corelib/strings_test.js

Index: test/codegen/expect/corelib/strings_test.js
diff --git a/test/codegen/expect/corelib/strings_test.js b/test/codegen/expect/corelib/strings_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..2d3492d03be7b457c58e22934f35c80b2db0419b
--- /dev/null
+++ b/test/codegen/expect/corelib/strings_test.js
@@ -0,0 +1,46 @@
+dart_library.library('corelib/strings_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__strings_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 strings_test = Object.create(null);
+  let ListOfint = () => (ListOfint = dart.constFn(core.List$(core.int)))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  strings_test.StringsTest = class StringsTest extends core.Object {
+    new() {
+    }
+    toString() {
+      return "Strings Tester";
+    }
+    static testCreation() {
+      let s = "Hello";
+      let l = ListOfint().new(s[dartx.length]);
+      for (let i = 0; i < dart.notNull(l[dartx.length]); i++) {
+        l[dartx.set](i, s[dartx.codeUnitAt](i));
+      }
+      let s2 = core.String.fromCharCodes(l);
+      expect$.Expect.equals(s, s2);
+    }
+    static testMain() {
+      strings_test.StringsTest.testCreation();
+    }
+  };
+  dart.setSignature(strings_test.StringsTest, {
+    constructors: () => ({new: dart.definiteFunctionType(strings_test.StringsTest, [])}),
+    statics: () => ({
+      testCreation: dart.definiteFunctionType(dart.dynamic, []),
+      testMain: dart.definiteFunctionType(dart.void, [])
+    }),
+    names: ['testCreation', 'testMain']
+  });
+  strings_test.main = function() {
+    strings_test.StringsTest.testMain();
+  };
+  dart.fn(strings_test.main, VoidTodynamic());
+  // Exports:
+  exports.strings_test = strings_test;
+});