Check in codegen test expectations.

test/codegen/expect/corelib/date_time8_test.js

Index: test/codegen/expect/corelib/date_time8_test.js
diff --git a/test/codegen/expect/corelib/date_time8_test.js b/test/codegen/expect/corelib/date_time8_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..c9784da8fdc3b14f1a6b9edab44466e1e6c10229
--- /dev/null
+++ b/test/codegen/expect/corelib/date_time8_test.js
@@ -0,0 +1,29 @@
+dart_library.library('corelib/date_time8_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__date_time8_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 date_time8_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  date_time8_test.testUtc = function() {
+    let d = new core.DateTime.utc(0, 1, 1);
+    expect$.Expect.equals("0000-01-01 00:00:00.000Z", d.toString());
+  };
+  dart.fn(date_time8_test.testUtc, VoidTodynamic());
+  date_time8_test.testLocal = function() {
+    let d = new core.DateTime(0, 1, 1);
+    expect$.Expect.equals("0000-01-01 00:00:00.000", d.toString());
+  };
+  dart.fn(date_time8_test.testLocal, VoidTodynamic());
+  date_time8_test.main = function() {
+    date_time8_test.testUtc();
+    date_time8_test.testLocal();
+  };
+  dart.fn(date_time8_test.main, VoidTodynamic());
+  // Exports:
+  exports.date_time8_test = date_time8_test;
+});