Migrated test block 17 to Dart 2.0.

tests/corelib/num_sign_test.dart

-// 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.
-// Test num.clamp.
-// VMOptions=--no-use-field-guards
-// VMOptions=
-
-import "package:expect/expect.dart";
-
-// Pedestrian implementation of sign, following its specification directly.
-num sign(num value) {
-  if (value is int) {
-    if (value < 0) return -1;
-    if (value > 0) return 1;
-    return 0;
-  }
-  if (value.isNaN) return value;
-  if (value == 0.0) return value;
-  if (value > 0.0) return 1.0;
-  return -1.0;
-}
-
-var numbers = [
-  // Integers
-  0,
-  1,
-  2,
-  0x7f, //                     ~7 bits
-  0x80,
-  0xff, //                     ~8 bits
-  0x100,
-  0xffff, //                   ~16 bits
-  0x10000,
-  0x3fffffff, //               ~30 bits (max positive 32-bit tagged smi)
-  0x40000000,
-  0x40000001,
-  0x7fffffff, //               ~31 bits
-  0x80000000,
-  0x80000001,
-  0xfffffffff, //              ~32 bits
-  0x100000000,
-  0x100000001,
-  0x10000000000000, //         ~53 bits
-  0x10000000000001,
-  0x1fffffffffffff,
-  0x20000000000000,
-  0x20000000000001, //         first integer not representable as double.
-  0x20000000000002,
-  0x7fffffffffffffff, //       ~63 bits
-  0x8000000000000000,
-  0x8000000000000001,
-  0xffffffffffffffff, //       ~64 bits
-  0x10000000000000000,
-  0x10000000000000001,
-  // Integers around the max-double range (2^1024, ~1025 bits).
-  0xfffffffffffff800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
-  0xfffffffffffffc00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
-  0x10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
-  // Doubles.
-  0.0,
-  5e-324, //                   min positive
-  2.225073858507201e-308, //   max denormal
-  2.2250738585072014e-308, //  min normal
-  0.49999999999999994, //      ~0.5
-  0.5,
-  0.5000000000000001,
-  0.9999999999999999, //       ~1.0
-  1.0,
-  1.0000000000000002,
-  4294967295.0, //             ~32 bits
-  4294967296.0,
-  4503599627370495.5, //       max fractional
-  4503599627370497.0,
-  9007199254740991.0,
-  9007199254740992.0, //       max exact (+1 is not a double)
-  1.7976931348623157e+308, //  max finite double
-  1.0 / 0.0, //                Infinity
-  0.0 / 0.0, //                NaN
-];
-
-main() {
-  for (num number in numbers) {
-    test(number);
-    test(-number);
-  }
-}
-
-void test(number) {
-  num expectSign = sign(number);
-  num actualSign = number.sign;
-  if (expectSign.isNaN) {
-    Expect.isTrue(actualSign.isNaN, "$number: $actualSign != NaN");
-  } else {
-    if (number is int) {
-      Expect.isTrue(actualSign is int, "$number.sign is int");
-    } else {
-      Expect.isTrue(actualSign is double, "$number.sign is double");
-    }
-    Expect.equals(expectSign, actualSign, "$number");
-    Expect.equals(number.isNegative, actualSign.isNegative, "$number:negative");
-    var renumber = actualSign * number.abs();
-    Expect.equals(number, renumber, "$number (sign*abs)");
-    if (number is int) {
-      Expect.isTrue(renumber is int, "$number (sign*abs) is int");
-    } else {
-      Expect.isTrue(renumber is double, "$number (sign*abs) is double");
-    }
-  }
-}