// 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.

// @dart = 2.9

/// @assertion double log(num x)
/// Returns negative infinity if [x] is equal to zero.
/// @description Checks that [log] returns negative infinity
/// if [x] is equal to zero.
/// @author msyabro
/// @reviewer pagolubev


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

main() {
  Expect.isTrue(Math.log(0).isInfinite);
  Expect.isTrue(Math.log(0).isNegative);

  Expect.isTrue(Math.log(-.0).isInfinite);
  Expect.isTrue(Math.log(-.0).isNegative);

  Expect.isTrue(Math.log(.0).isInfinite);
  Expect.isTrue(Math.log(.0).isNegative);
}