Add corelib tests

test/codegen/corelib/double_round_to_double3_test.dart

Index: test/codegen/corelib/double_round_to_double3_test.dart
diff --git a/test/codegen/corelib/double_round_to_double3_test.dart b/test/codegen/corelib/double_round_to_double3_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..660c7b6645a07c731d94bfbcb65924c118e9cbcc
--- /dev/null
+++ b/test/codegen/corelib/double_round_to_double3_test.dart
@@ -0,0 +1,34 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+
+main() {
+  // The following numbers are on the border of 52 bits.
+  // For example: 4503599627370499 + 0.5 => 4503599627370500.
+  Expect.equals(4503599627370496.0, 4503599627370496.0.roundToDouble());
+  Expect.equals(4503599627370497.0, 4503599627370497.0.roundToDouble());
+  Expect.equals(4503599627370498.0, 4503599627370498.0.roundToDouble());
+  Expect.equals(4503599627370499.0, 4503599627370499.0.roundToDouble());
+  Expect.equals(9007199254740991.0, 9007199254740991.0.roundToDouble());
+  Expect.equals(9007199254740992.0, 9007199254740992.0.roundToDouble());
+  Expect.equals(-4503599627370496.0, (-4503599627370496.0).roundToDouble());
+  Expect.equals(-4503599627370497.0, (-4503599627370497.0).roundToDouble());
+  Expect.equals(-4503599627370498.0, (-4503599627370498.0).roundToDouble());
+  Expect.equals(-4503599627370499.0, (-4503599627370499.0).roundToDouble());
+  Expect.equals(-9007199254740991.0, (-9007199254740991.0).roundToDouble());
+  Expect.equals(-9007199254740992.0, (-9007199254740992.0).roundToDouble());
+  Expect.isTrue(4503599627370496.0.roundToDouble() is double);
+  Expect.isTrue(4503599627370497.0.roundToDouble() is double);
+  Expect.isTrue(4503599627370498.0.roundToDouble() is double);
+  Expect.isTrue(4503599627370499.0.roundToDouble() is double);
+  Expect.isTrue(9007199254740991.0.roundToDouble() is double);
+  Expect.isTrue(9007199254740992.0.roundToDouble() is double);
+  Expect.isTrue((-4503599627370496.0).roundToDouble() is double);
+  Expect.isTrue((-4503599627370497.0).roundToDouble() is double);
+  Expect.isTrue((-4503599627370498.0).roundToDouble() is double);
+  Expect.isTrue((-4503599627370499.0).roundToDouble() is double);
+  Expect.isTrue((-9007199254740991.0).roundToDouble() is double);
+  Expect.isTrue((-9007199254740992.0).roundToDouble() is double);
+}