// Copyright (c) 2011, 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.

/// @assertion static void approxEquals(num expected, num actual,
///   [num tolerance = null, String reason = ''])
/// Failure if the difference between expected and actual is greater than the
/// given tolerance.
/// @description Checks that no exception is thrown when the difference between
/// arguments is equal to specified non-negative, non-NAN tolerance, regardless
/// of reason (the last argument). Also checks the case when the specified
/// tolerance is negative zero (0.0 == -0.0).
/// @author rodionov

import "../../../Utils/expect.dart";
import "dart:math" as Math;

main() {
  final double MIN_DOUBLE = Math.pow(2.0, -1074) as double;
  final double NEG_MIN_DOUBLE = -1 * MIN_DOUBLE; 
  final double MAX_DOUBLE =
      (2 - Math.pow(2.0, -52)) * Math.pow(2.0, 1023) as double;
  final double NEG_MAX_DOUBLE = -1 * MAX_DOUBLE; 

  Expect.approxEquals(100.0, 101, 1);
  Expect.approxEquals(100.0, 101, 1, "");
  Expect.approxEquals(100.0, 101, 1, "not empty");

  Expect.approxEquals(101, 100.0, 1);
  Expect.approxEquals(101, 100.0, 1, "");
  Expect.approxEquals(101, 100.0, 1, "not empty");

  Expect.approxEquals(100, 100.0, 0);
  Expect.approxEquals(100, 100.0, 0, "");
  Expect.approxEquals(100, 100.0, 0, "not empty");

  Expect.approxEquals(100, -100.0, 200);
  Expect.approxEquals(100, -100.0, 200, "");
  Expect.approxEquals(100, -100.0, 200, "not empty");

  Expect.approxEquals(-100, 100.0, 200);
  Expect.approxEquals(-100, 100.0, 200, "");
  Expect.approxEquals(-100, 100.0, 200, "not empty");

  Expect.approxEquals(100, 100, -0.0);
  Expect.approxEquals(100, 100, -0.0, "");
  Expect.approxEquals(100, 100, -0.0, "not empty");

  Expect.approxEquals(double.infinity, 0, double.infinity);
  Expect.approxEquals(double.infinity, 0, double.infinity, "");
  Expect.approxEquals(double.infinity, 0, double.infinity, "not empty");

  Expect.approxEquals(double.negativeInfinity, 0, double.infinity);
  Expect.approxEquals(double.negativeInfinity, 0, double.infinity, "");
  Expect.approxEquals(double.negativeInfinity, 0, double.infinity, "not empty");

  Expect.approxEquals(double.infinity, MAX_DOUBLE, double.infinity);
  Expect.approxEquals(double.infinity, MAX_DOUBLE, double.infinity, "");
  Expect.approxEquals(double.infinity, MAX_DOUBLE, double.infinity, "not empty");

  Expect.approxEquals(double.negativeInfinity, MAX_DOUBLE, double.infinity);
  Expect.approxEquals(double.negativeInfinity, MAX_DOUBLE, double.infinity, "");
  Expect.approxEquals(double.negativeInfinity, MAX_DOUBLE, double.infinity, "not empty");

  Expect.approxEquals(double.infinity, NEG_MAX_DOUBLE, double.infinity);
  Expect.approxEquals(double.infinity, NEG_MAX_DOUBLE, double.infinity, "");
  Expect.approxEquals(double.infinity, NEG_MAX_DOUBLE, double.infinity, "not empty");

  Expect.approxEquals(double.negativeInfinity, NEG_MAX_DOUBLE, double.infinity);
  Expect.approxEquals(double.negativeInfinity, NEG_MAX_DOUBLE, double.infinity, "");
  Expect.approxEquals(double.negativeInfinity, NEG_MAX_DOUBLE, double.infinity, "not empty");
}