/*
 * test/13_drhtz-drhfz.js - drhtz and drhfz tests
 *
 * @licstart  The following is the entire license notice for the
 * JavaScript code in this file.
 *
 * Copyright (C) 2017  Libiquity LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As additional permission under GNU GPL version 3 section 7, you
 * may distribute non-source (e.g. minimized or compacted) forms of
 * this program without the copy of the GNU GPL normally required by
 * section 4, provided you include this license notice and a URL
 * through which recipients can access the Corresponding Source.
 *
 * @licend  The above is the entire license notice
 * for the JavaScript code in this file.
 */

var assert = require("assert");
require("../lib/decmath.js");

describe("drhtz() and drhfz()", function() {
	context("without tie-breaking", function() {
		var tests = [
			/*    a  p       r   functions   */
			[ 23.1 , 0,  "23." , drhtz, drhfz],
			[ 23.9 , 0,  "24." , drhtz, drhfz],
			[  2.31, 1,   "2.3", drhtz, drhfz],
			[  2.39, 1,   "2.4", drhtz, drhfz],
			[-23.1 , 0, "-23." , drhtz, drhfz],
			[-23.9 , 0, "-24." , drhtz, drhfz],
			[ -2.31, 1,  "-2.3", drhtz, drhfz],
			[ -2.39, 1,  "-2.4", drhtz, drhfz],
		];
		tests.forEach(function(test) {
			test.slice(3).forEach(function(f) {
				var rule;
				switch (f) {
					case drhtz:
						rule = "toward zero";
						break;
					case drhfz:
						rule = "away from zero";
						break;
				}
				it("correctly round " + rule + " " + test[0] +
					" with precision " + test[1] + " to " +
					test[2], function() {
						assert.equal(
							f(test[0], test[1]),
							test[2]);
				});
			});
		});
	});
	context("with tie-breaking", function() {
		var tests = [
			/*    a  p       r   functions   */
			[ 23.5 , 0,  "23." , drhtz       ],
			[ 23.5 , 0,  "24." ,        drhfz],
			[  2.35, 1,   "2.3", drhtz       ],
			[  2.35, 1,   "2.4",        drhfz],
			[-23.5 , 0, "-23." , drhtz       ],
			[-23.5 , 0, "-24." ,        drhfz],
			[ -2.35, 1,  "-2.3", drhtz       ],
			[ -2.35, 1,  "-2.4",        drhfz],
		];
		tests.forEach(function(test) {
			test.slice(3).forEach(function(f) {
				var rule;
				switch (f) {
					case drhtz:
						rule = "toward zero";
						break;
					case drhfz:
						rule = "away from zero";
						break;
				}
				it("correctly round " + rule + " " + test[0] +
					" with precision " + test[1] + " to " +
					test[2], function() {
						assert.equal(
							f(test[0], test[1]),
							test[2]);
				});
			});
		});
	});
	context("with invalid precision", function() {
		var tests = [
			/*    a  p       r   functions   */
			[ 23   , 1,    null, drhtz, drhfz],
		];
		tests.forEach(function(test) {
			test.slice(3).forEach(function(f) {
				var rule;
				switch (f) {
					case drhtz:
						rule = "toward zero";
						break;
					case drhfz:
						rule = "away from zero";
						break;
				}
				it("correctly round " + rule + " " + test[0] +
					" with precision " + test[1] + " to " +
					test[2], function() {
						assert.equal(
							f(test[0], test[1]),
							test[2]);
				});
			});
		});
	});
});