tests/mozilla/ecma/Math/15.8.2.4.js

   1 /* The contents of this file are subject to the Netscape Public
   2  * License Version 1.1 (the "License"); you may not use this file
   3  * except in compliance with the License. You may obtain a copy of
   4  * the License at http://www.mozilla.org/NPL/
   5  *
   6  * Software distributed under the License is distributed on an "AS
   7  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
   8  * implied. See the License for the specific language governing
   9  * rights and limitations under the License.
  10  *
  11  * The Original Code is Mozilla Communicator client code, released March
  12  * 31, 1998.
  13  *
  14  * The Initial Developer of the Original Code is Netscape Communications
  15  * Corporation. Portions created by Netscape are
  16  * Copyright (C) 1998 Netscape Communications Corporation. All
  17  * Rights Reserved.
  18  *
  19  * Contributor(s):
  20  *
  21  */
  22  /**
  23     File Name:          15.8.2.4.js
  24     ECMA Section:       15.8.2.4 atan( x )
  25     Description:        return an approximation to the arc tangent of the
  26                         argument.  the result is expressed in radians and
  27                         range is from -PI/2 to +PI/2.  special cases:
  28                         - if x is NaN,  the result is NaN
  29                         - if x == +0,   the result is +0
  30                         - if x == -0,   the result is -0
  31                         - if x == +Infinity,    the result is approximately +PI/2
  32                         - if x == -Infinity,    the result is approximately -PI/2
  33     Author:             christine@netscape.com
  34     Date:               7 july 1997
  35
  36 */
  37
  38     var SECTION = "15.8.2.4";
  39     var VERSION = "ECMA_1";
  40     startTest();
  41     var TITLE   = "Math.atan()";
  42     var BUGNUMBER="77391";
  43
  44     writeHeaderToLog( SECTION + " "+ TITLE);
  45
  46     var testcases = getTestCases();
  47     test();
  48
  49 function getTestCases() {
  50     var array = new Array();
  51     var item = 0;
  52
  53     array[item++] = new TestCase( SECTION,   "Math.atan.length",        1,              Math.atan.length );
  54
  55     array[item++] = new TestCase( SECTION,   "Math.atan()",             Number.NaN,     Math.atan() );
  56     array[item++] = new TestCase( SECTION,   "Math.atan(void 0)",       Number.NaN,     Math.atan(void 0) );
  57     array[item++] = new TestCase( SECTION,   "Math.atan(null)",         0,              Math.atan(null) );
  58     array[item++] = new TestCase( SECTION,   "Math.atan(NaN)",          Number.NaN,     Math.atan(Number.NaN) );
  59
  60     array[item++] = new TestCase( SECTION,   "Math.atan('a string')",   Number.NaN,     Math.atan("a string") );
  61     array[item++] = new TestCase( SECTION,   "Math.atan('0')",          0,              Math.atan('0') );
  62     array[item++] = new TestCase( SECTION,   "Math.atan('1')",          Math.PI/4,      Math.atan('1') );
  63     array[item++] = new TestCase( SECTION,   "Math.atan('-1')",         -Math.PI/4,     Math.atan('-1') );
  64     array[item++] = new TestCase( SECTION,   "Math.atan('Infinity)",    Math.PI/2,      Math.atan('Infinity') );
  65     array[item++] = new TestCase( SECTION,   "Math.atan('-Infinity)",   -Math.PI/2,     Math.atan('-Infinity') );
  66
  67     array[item++] = new TestCase( SECTION,   "Math.atan(0)",            0,              Math.atan(0)          );
  68     array[item++] = new TestCase( SECTION,   "Math.atan(-0)",           -0,             Math.atan(-0)         );
  69     array[item++] = new TestCase( SECTION,   "Infinity/Math.atan(-0)",  -Infinity,      Infinity/Math.atan(-0) );
  70     array[item++] = new TestCase( SECTION,   "Math.atan(Infinity)",     Math.PI/2,      Math.atan(Number.POSITIVE_INFINITY) );
  71     array[item++] = new TestCase( SECTION,   "Math.atan(-Infinity)",    -Math.PI/2,     Math.atan(Number.NEGATIVE_INFINITY) );
  72     array[item++] = new TestCase( SECTION,   "Math.atan(1)",                Math.PI/4,      Math.atan(1)          );
  73     array[item++] = new TestCase( SECTION,   "Math.atan(-1)",           -Math.PI/4,     Math.atan(-1)         );
  74     return array;
  75 }
  76 function test() {
  77     for ( tc=0; tc < testcases.length; tc++ ) {
  78         testcases[tc].passed = writeTestCaseResult(
  79                             testcases[tc].expect,
  80                             testcases[tc].actual,
  81                             testcases[tc].description +" = "+
  82                             testcases[tc].actual );
  83
  84         testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
  85     }
  86     stopTest();
  87     return ( testcases );
  88 }