ceil/floor/truncate/round return integers.

tests/corelib/double_round_to_double_test.dart

Index: tests/corelib/double_round_to_double_test.dart
diff --git a/tests/corelib/double_round_to_double_test.dart b/tests/corelib/double_round_to_double_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8b00ed27aef251ac8d56b4f2fa26c9dd3093b1cb
--- /dev/null
+++ b/tests/corelib/double_round_to_double_test.dart
@@ -0,0 +1,91 @@
+// 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.
+
+main() {
+  Expect.equals(0.0, 0.0.roundToDouble());
+  Expect.equals(0.0, double.MIN_POSITIVE.roundToDouble());
+  Expect.equals(0.0, (2.0 * double.MIN_POSITIVE).roundToDouble());
+  Expect.equals(0.0, (1.18e-38).roundToDouble());
+  Expect.equals(0.0, (1.18e-38 * 2).roundToDouble());
+  Expect.equals(0.0, 0.49999999999999994.roundToDouble());
+  Expect.equals(1.0, 0.5.roundToDouble());
+  Expect.equals(1.0, 0.9999999999999999.roundToDouble());
+  Expect.equals(1.0, 1.0.roundToDouble());
+  Expect.equals(1.0, 1.000000000000001.roundToDouble());
+  Expect.equals(2.0, 1.5.roundToDouble());
+  // 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(double.MAX_FINITE, double.MAX_FINITE.roundToDouble());
+
+  Expect.equals(0.0, (-double.MIN_POSITIVE).roundToDouble());
+  Expect.equals(0.0, (2.0 * -double.MIN_POSITIVE).roundToDouble());
+  Expect.equals(0.0, (-1.18e-38).roundToDouble());
+  Expect.equals(0.0, (-1.18e-38 * 2).roundToDouble());
+  Expect.equals(0.0, (-0.49999999999999994).roundToDouble());
+  Expect.equals(-1.0, (-0.5).roundToDouble());
+  Expect.equals(-1.0, (-0.9999999999999999).roundToDouble());
+  Expect.equals(-1.0, (-1.0).roundToDouble());
+  Expect.equals(-1.0, (-1.000000000000001).roundToDouble());
+  Expect.equals(-2.0, (-1.5).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.equals(-double.MAX_FINITE, (-double.MAX_FINITE).roundToDouble());
+
+  Expect.equals(double.INFINITY, double.INFINITY.roundToDouble());
+  Expect.equals(double.NEGATIVE_INFINITY,
+                double.NEGATIVE_INFINITY.roundToDouble());
+  Expect.isTrue(double.NAN.roundToDouble().isNaN);
+
+  Expect.isTrue(0.0.roundToDouble() is double);
+  Expect.isTrue(double.MIN_POSITIVE.roundToDouble() is double);
+  Expect.isTrue((2.0 * double.MIN_POSITIVE).roundToDouble() is double);
+  Expect.isTrue((1.18e-38).roundToDouble() is double);
+  Expect.isTrue((1.18e-38 * 2).roundToDouble() is double);
+  Expect.isTrue(0.49999999999999994.roundToDouble() is double);
+  Expect.isTrue(0.5.roundToDouble() is double);
+  Expect.isTrue(0.9999999999999999.roundToDouble() is double);
+  Expect.isTrue(1.0.roundToDouble() is double);
+  Expect.isTrue(1.000000000000001.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);
+  Expect.isTrue(double.MAX_FINITE.roundToDouble() is double);
+
+  Expect.isTrue((-double.MIN_POSITIVE).roundToDouble().isNegative);
+  Expect.isTrue((2.0 * -double.MIN_POSITIVE).roundToDouble().isNegative);
+  Expect.isTrue((-1.18e-38).roundToDouble().isNegative);
+  Expect.isTrue((-1.18e-38 * 2).roundToDouble().isNegative);
+  Expect.isTrue((-0.49999999999999994).roundToDouble().isNegative);
+
+  Expect.isTrue((-double.MIN_POSITIVE).roundToDouble() is double);
+  Expect.isTrue((2.0 * -double.MIN_POSITIVE).roundToDouble() is double);
+  Expect.isTrue((-1.18e-38).roundToDouble() is double);
+  Expect.isTrue((-1.18e-38 * 2).roundToDouble() is double);
+  Expect.isTrue((-0.49999999999999994).roundToDouble() is double);
+  Expect.isTrue((-0.5).roundToDouble() is double);
+  Expect.isTrue((-0.9999999999999999).roundToDouble() is double);
+  Expect.isTrue((-1.0).roundToDouble() is double);
+  Expect.isTrue((-1.000000000000001).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);
+  Expect.isTrue((-double.MAX_FINITE).roundToDouble() is double);
+}