michael@0: // Copyright 2009 the Sputnik authors.  All rights reserved.
michael@0: // This code is governed by the BSD license found in the LICENSE file.
michael@0: 
michael@0: /**
michael@0:  * The production x -= y is the same as x = x - y
michael@0:  *
michael@0:  * @path ch11/11.13/11.13.2/S11.13.2_A4.5_T2.4.js
michael@0:  * @description Type(x) is different from Type(y) and both types vary between Number (primitive or object) and Undefined
michael@0:  */
michael@0: 
michael@0: //CHECK#1
michael@0: x = 1;
michael@0: x -= undefined;
michael@0: if (isNaN(x) !== true) {
michael@0:   $ERROR('#1: x = 1; x -= undefined; x === Not-a-Number. Actual: ' + (x));
michael@0: }
michael@0: 
michael@0: //CHECK#2
michael@0: x = undefined;
michael@0: x -= 1;
michael@0: if (isNaN(x) !== true) {
michael@0:   $ERROR('#2: x = undefined; x -= 1; x === Not-a-Number. Actual: ' + (x));
michael@0: }
michael@0: 
michael@0: //CHECK#3
michael@0: x = new Number(1);
michael@0: x -= undefined;
michael@0: if (isNaN(x) !== true) {
michael@0:   $ERROR('#3: x = new Number(1); x -= undefined; x === Not-a-Number. Actual: ' + (x));
michael@0: }
michael@0: 
michael@0: //CHECK#4
michael@0: x = undefined;
michael@0: x -= new Number(1);
michael@0: if (isNaN(x) !== true) {
michael@0:   $ERROR('#4: x = undefined; x -= new Number(1); x === Not-a-Number. Actual: ' + (x));
michael@0: }
michael@0: