Check in codegen test expectations.

test/codegen/expect/corelib/date_time6_test.js

Index: test/codegen/expect/corelib/date_time6_test.js
diff --git a/test/codegen/expect/corelib/date_time6_test.js b/test/codegen/expect/corelib/date_time6_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..bf4cb35d20e8d1db189b49bea420ef34a1a49631
--- /dev/null
+++ b/test/codegen/expect/corelib/date_time6_test.js
@@ -0,0 +1,37 @@
+dart_library.library('corelib/date_time6_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__date_time6_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_time6_test = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  date_time6_test.main = function() {
+    let d = new core.DateTime.fromMillisecondsSinceEpoch(0, {isUtc: true});
+    let d2 = new core.DateTime.fromMillisecondsSinceEpoch(1, {isUtc: true});
+    expect$.Expect.isTrue(d.isBefore(d2));
+    expect$.Expect.isTrue(!dart.test(d.isAfter(d2)));
+    expect$.Expect.isTrue(d2.isAfter(d));
+    expect$.Expect.isTrue(!dart.test(d2.isBefore(d)));
+    expect$.Expect.isFalse(d2.isBefore(d));
+    expect$.Expect.isFalse(!dart.test(d2.isAfter(d)));
+    expect$.Expect.isFalse(d.isAfter(d2));
+    expect$.Expect.isFalse(!dart.test(d.isBefore(d2)));
+    d = new core.DateTime.fromMillisecondsSinceEpoch(-1, {isUtc: true});
+    d2 = new core.DateTime.fromMillisecondsSinceEpoch(0, {isUtc: true});
+    expect$.Expect.isTrue(d.isBefore(d2));
+    expect$.Expect.isTrue(!dart.test(d.isAfter(d2)));
+    expect$.Expect.isTrue(d2.isAfter(d));
+    expect$.Expect.isTrue(!dart.test(d2.isBefore(d)));
+    expect$.Expect.isFalse(d2.isBefore(d));
+    expect$.Expect.isFalse(!dart.test(d2.isAfter(d)));
+    expect$.Expect.isFalse(d.isAfter(d2));
+    expect$.Expect.isFalse(!dart.test(d.isBefore(d2)));
+  };
+  dart.fn(date_time6_test.main, VoidTodynamic());
+  // Exports:
+  exports.date_time6_test = date_time6_test;
+});