LibTest/math/atan2_A02_t01.dart

// 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 double atan2(num a, num b)
/// If [b] is positive, this is the same as atan(b/a).
/// @description Checks that if [b] is positive, the result equals
/// atan([a]/[b]).
/// @author msyabro

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

check(num a, num b) {
  Expect.equals(Math.atan(a / b), Math.atan2(a, b));
}

main() {
  check(1, 1);
  check(-0.2, 1);
  check(2.0, .0);
  check(.0, 1e20);
  check(double.negativeInfinity, 0);
  check(double.infinity, 0);
}