| // 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 using negative tolerance (except negative zero) or |
| /// NAN as either argument always results in failure. Negative tolerances tested |
| /// include doubles of minimum and maximum possible magnitude. |
| /// @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; |
| |
| check(0, 0, double.negativeInfinity); |
| check(0, 0, double.negativeInfinity, ""); |
| check(0, 0, double.negativeInfinity, "not empty"); |
| |
| check(0, 0, NEG_MAX_DOUBLE); |
| check(0, 0, NEG_MAX_DOUBLE, ""); |
| check(0, 0, NEG_MAX_DOUBLE, "not empty"); |
| |
| check(0, 0, NEG_MIN_DOUBLE); |
| check(0, 0, NEG_MIN_DOUBLE, ""); |
| check(0, 0, NEG_MIN_DOUBLE, "not empty"); |
| |
| // inf - inf -> NaN |
| check(double.infinity, double.infinity, double.infinity); |
| check(double.infinity, double.infinity, double.infinity, ""); |
| check(double.infinity, double.infinity, double.infinity, "not empty"); |
| |
| check(double.negativeInfinity, double.negativeInfinity, double.infinity); |
| check(double.negativeInfinity, double.negativeInfinity, double.infinity, ""); |
| check(double.negativeInfinity, double.negativeInfinity, double.infinity, |
| "not empty"); |
| |
| check(0, double.nan, double.infinity); |
| check(0, double.nan, double.infinity, ""); |
| check(0, double.nan, double.infinity, "not empty"); |
| |
| check(0, 0, double.nan); |
| check(0, 0, double.nan, ""); |
| check(0, 0, double.nan, "not empty"); |
| } |
| |
| void check(num arg1, num arg2, num tolerance, [String reason = '']) { |
| try { |
| Expect.approxEquals(arg1, arg2, tolerance, reason); |
| throw new Exception("ExpectException expected"); |
| } on ExpectException catch(e) { |
| } |
| } |