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comparison: js/src/tests/ecma/Math/15.8.2.18.js
js/src/tests/ecma/Math/15.8.2.18.js
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 | |
| 7 /** | |
| 8 File Name: 15.8.2.18.js | |
| 9 ECMA Section: 15.8.2.18 tan( x ) | |
| 10 Description: return an approximation to the tan of the | |
| 11 argument. argument is expressed in radians | |
| 12 special cases: | |
| 13 - if x is NaN result is NaN | |
| 14 - if x is 0 result is 0 | |
| 15 - if x is -0 result is -0 | |
| 16 - if x is Infinity or -Infinity result is NaN | |
| 17 Author: christine@netscape.com | |
| 18 Date: 7 july 1997 | |
| 19 */ | |
| 20 | |
| 21 var SECTION = "15.8.2.18"; | |
| 22 var VERSION = "ECMA_1"; | |
| 23 startTest(); | |
| 24 var TITLE = "Math.tan(x)"; | |
| 25 var EXCLUDE = "true"; | |
| 26 | |
| 27 writeHeaderToLog( SECTION + " "+ TITLE); | |
| 28 | |
| 29 new TestCase( SECTION, | |
| 30 "Math.tan.length", | |
| 31 1, | |
| 32 Math.tan.length ); | |
| 33 | |
| 34 new TestCase( SECTION, | |
| 35 "Math.tan()", | |
| 36 Number.NaN, | |
| 37 Math.tan() ); | |
| 38 | |
| 39 new TestCase( SECTION, | |
| 40 "Math.tan(void 0)", | |
| 41 Number.NaN, | |
| 42 Math.tan(void 0)); | |
| 43 | |
| 44 new TestCase( SECTION, | |
| 45 "Math.tan(null)", | |
| 46 0, | |
| 47 Math.tan(null) ); | |
| 48 | |
| 49 new TestCase( SECTION, | |
| 50 "Math.tan(false)", | |
| 51 0, | |
| 52 Math.tan(false) ); | |
| 53 | |
| 54 new TestCase( SECTION, | |
| 55 "Math.tan(NaN)", | |
| 56 Number.NaN, | |
| 57 Math.tan(Number.NaN) ); | |
| 58 | |
| 59 new TestCase( SECTION, | |
| 60 "Math.tan(0)", | |
| 61 0, | |
| 62 Math.tan(0)); | |
| 63 | |
| 64 new TestCase( SECTION, | |
| 65 "Math.tan(-0)", | |
| 66 -0, | |
| 67 Math.tan(-0)); | |
| 68 | |
| 69 new TestCase( SECTION, | |
| 70 "Math.tan(Infinity)", | |
| 71 Number.NaN, | |
| 72 Math.tan(Number.POSITIVE_INFINITY)); | |
| 73 | |
| 74 new TestCase( SECTION, | |
| 75 "Math.tan(-Infinity)", | |
| 76 Number.NaN, | |
| 77 Math.tan(Number.NEGATIVE_INFINITY)); | |
| 78 | |
| 79 new TestCase( SECTION, | |
| 80 "Math.tan(Math.PI/4)", | |
| 81 1, | |
| 82 Math.tan(Math.PI/4)); | |
| 83 | |
| 84 new TestCase( SECTION, | |
| 85 "Math.tan(3*Math.PI/4)", | |
| 86 -1, | |
| 87 Math.tan(3*Math.PI/4)); | |
| 88 | |
| 89 new TestCase( SECTION, | |
| 90 "Math.tan(Math.PI)", | |
| 91 -0, | |
| 92 Math.tan(Math.PI)); | |
| 93 | |
| 94 new TestCase( SECTION, | |
| 95 "Math.tan(5*Math.PI/4)", | |
| 96 1, | |
| 97 Math.tan(5*Math.PI/4)); | |
| 98 | |
| 99 new TestCase( SECTION, | |
| 100 "Math.tan(7*Math.PI/4)", | |
| 101 -1, | |
| 102 Math.tan(7*Math.PI/4)); | |
| 103 | |
| 104 new TestCase( SECTION, | |
| 105 "Infinity/Math.tan(-0)", | |
| 106 -Infinity, | |
| 107 Infinity/Math.tan(-0) ); | |
| 108 | |
| 109 /* | |
| 110 Arctan (x) ~ PI/2 - 1/x for large x. For x = 1.6x10^16, 1/x is about the last binary digit of double precision PI/2. | |
| 111 That is to say, perturbing PI/2 by this much is about the smallest rounding error possible. | |
| 112 | |
| 113 This suggests that the answer Christine is getting and a real Infinity are "adjacent" results from the tangent function. I | |
| 114 suspect that tan (PI/2 + one ulp) is a negative result about the same size as tan (PI/2) and that this pair are the closest | |
| 115 results to infinity that the algorithm can deliver. | |
| 116 | |
| 117 In any case, my call is that the answer we're seeing is "right". I suggest the test pass on any result this size or larger. | |
| 118 = C = | |
| 119 */ | |
| 120 | |
| 121 new TestCase( SECTION, | |
| 122 "Math.tan(3*Math.PI/2) >= 5443000000000000", | |
| 123 true, | |
| 124 Math.tan(3*Math.PI/2) >= 5443000000000000 ); | |
| 125 | |
| 126 new TestCase( SECTION, | |
| 127 "Math.tan(Math.PI/2) >= 5443000000000000", | |
| 128 true, | |
| 129 Math.tan(Math.PI/2) >= 5443000000000000 ); | |
| 130 | |
| 131 test(); |
