tests/corelib/double_round_to_double_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.

import 'package:expect/expect.dart';

main() {
  Expect.equals(0.0, 0.0.roundToDouble());
  Expect.equals(0.0, double.minPositive.roundToDouble());
  Expect.equals(0.0, (2.0 * double.minPositive).roundToDouble());
  Expect.equals(0.0, (1.18e-38).roundToDouble());
  Expect.equals(0.0, (1.18e-38 * 2).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(double.maxFinite, double.maxFinite.roundToDouble());

  Expect.equals(0.0, (-double.minPositive).roundToDouble());
  Expect.equals(0.0, (2.0 * -double.minPositive).roundToDouble());
  Expect.equals(0.0, (-1.18e-38).roundToDouble());
  Expect.equals(0.0, (-1.18e-38 * 2).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(-double.maxFinite, (-double.maxFinite).roundToDouble());

  Expect.equals(double.infinity, double.infinity.roundToDouble());
  Expect.equals(
    double.negativeInfinity,
    double.negativeInfinity.roundToDouble(),
  );
  Expect.isTrue(double.nan.roundToDouble().isNaN);

  Expect.isTrue(0.0.roundToDouble() is double);
  Expect.isTrue(double.minPositive.roundToDouble() is double);
  Expect.isTrue((2.0 * double.minPositive).roundToDouble() is double);
  Expect.isTrue((1.18e-38).roundToDouble() is double);
  Expect.isTrue((1.18e-38 * 2).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(double.maxFinite.roundToDouble() is double);

  Expect.isTrue((-double.minPositive).roundToDouble().isNegative);
  Expect.isTrue((2.0 * -double.minPositive).roundToDouble().isNegative);
  Expect.isTrue((-1.18e-38).roundToDouble().isNegative);
  Expect.isTrue((-1.18e-38 * 2).roundToDouble().isNegative);

  Expect.isTrue((-double.minPositive).roundToDouble() is double);
  Expect.isTrue((2.0 * -double.minPositive).roundToDouble() is double);
  Expect.isTrue((-1.18e-38).roundToDouble() is double);
  Expect.isTrue((-1.18e-38 * 2).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((-double.maxFinite).roundToDouble() is double);
}