Check in codegen test expectations.

test/codegen/expect/corelib/date_time3_test.js

Index: test/codegen/expect/corelib/date_time3_test.js
diff --git a/test/codegen/expect/corelib/date_time3_test.js b/test/codegen/expect/corelib/date_time3_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..fcfff5996647db07c6c4c16d8fad7b87ea881046
--- /dev/null
+++ b/test/codegen/expect/corelib/date_time3_test.js
@@ -0,0 +1,20 @@
+dart_library.library('corelib/date_time3_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__date_time3_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_time3_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  date_time3_test.main = function() {
+    let s = "2012-01-30 08:30:00.010";
+    let d = core.DateTime.parse(s);
+    expect$.Expect.equals(s, dart.toString(d));
+  };
+  dart.fn(date_time3_test.main, VoidTodynamic());
+  // Exports:
+  exports.date_time3_test = date_time3_test;
+});