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
49function 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}
76function 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}