JSTests/mozilla/ecma/Array/15.4.5.2-2.js

/* The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Mozilla Communicator client code, released March
 * 31, 1998.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation. Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 * 
 */
/**
    File Name:          15.4.5.2-2.js
    ECMA Section:       Array.length
    Description:
    15.4.5.2 length
    The length property of this Array object is always numerically greater
    than the name of every property whose name is an array index.

    The length property has the attributes { DontEnum, DontDelete }.

    This test verifies that the Array.length property is not Read Only.

    Author:             christine@netscape.com
    Date:               12 november 1997
*/

    var SECTION = "15.4.5.2-2";
    var VERSION = "ECMA_1";
    startTest();
    var TITLE   = "Array.length";

    writeHeaderToLog( SECTION + " "+ TITLE);

    var testcases = new Array();

    addCase( new Array(), 0, Math.pow(2,14), Math.pow(2,14) );

    addCase( new Array(), 0, 1, 1 );

    addCase( new Array(Math.pow(2,12)), Math.pow(2,12), 0, 0 );
    addCase( new Array(Math.pow(2,13)), Math.pow(2,13), Math.pow(2,12), Math.pow(2,12) );
    addCase( new Array(Math.pow(2,12)), Math.pow(2,12), Math.pow(2,12), Math.pow(2,12) );
    addCase( new Array(Math.pow(2,14)), Math.pow(2,14), Math.pow(2,12), Math.pow(2,12) )

    // some tests where array is not empty
    // array is populated with strings
    for ( var arg = "", i = 0; i < Math.pow(2,12); i++ ) {
        arg +=  String(i) + ( i != Math.pow(2,12)-1 ? "," : "" );

    }
//      print(i +":"+arg);

    var a = eval( "new Array("+arg+")" );

    addCase( a, i, i, i );
    addCase( a, i, Math.pow(2,12)+i+1, Math.pow(2,12)+i+1, true );
    addCase( a, Math.pow(2,12)+5, 0, 0, true );

    test();

function addCase( object, old_len, set_len, new_len, checkitems ) {
    object.length = set_len;

    testcases[testcases.length] = new TestCase( SECTION,
        "array = new Array("+ old_len+"); array.length = " + set_len +
        "; array.length",
        new_len,
        object.length );

    if ( checkitems ) {
    // verify that items between old and newlen are all undefined
    if ( new_len < old_len ) {
        var passed = true;
        for ( var i = new_len; i < old_len; i++ ) {
            if ( object[i] != void 0 ) {
                passed = false;
            }
        }
        testcases[testcases.length] = new TestCase( SECTION,
            "verify that array items have been deleted",
            true,
            passed );
    }
    if ( new_len > old_len ) {
        var passed = true;
        for ( var i = old_len; i < new_len; i++ ) {
            if ( object[i] != void 0 ) {
                passed = false;
            }
        }
        testcases[testcases.length] = new TestCase( SECTION,
            "verify that new items are undefined",
            true,
            passed );
    }
    }

}

function test() {
    for ( tc=0; tc < testcases.length; tc++ ) {
        testcases[tc].passed = writeTestCaseResult(
                            testcases[tc].expect,
                            testcases[tc].actual,
                            testcases[tc].description +" = "+
                            testcases[tc].actual );

        testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
    }
    stopTest();
    return ( testcases );
}