The Tor Browser / file revision

 "use strict";

 Components.utils.import("resource:///modules/ContentUtil.jsm");

 let Util = ContentUtil;

 function run_test() {

   do_print("Testing Util.extend");

   do_print("Check if function is defined");

   do_check_true(!!Util.extend);

   do_print("No parameter or null should return a new object");

   let noArgRes = Util.extend();

   do_check_true(noArgRes && typeof noArgRes == "object");

   let nullRes = Util.extend(null);

   do_check_true(nullRes && typeof nullRes == "object");

   do_print("Simple extend");

   let simpleExtend = {a: 1, b: 2};

   let simpleExtendResult = Util.extend(simpleExtend, {b: 3, c: 4});

   do_check_true(simpleExtend.a === 1 && simpleExtend.b === 3 && simpleExtend.c === 4);

   do_check_true(simpleExtendResult === simpleExtend);

   do_print("Cloning");

   let cloneExtend = {a: 1, b: 2};

   let cloned = Util.extend({}, cloneExtend);

   do_check_true(cloneExtend.a === cloned.a && cloneExtend.b === cloned.b);

   do_check_true(cloneExtend !== cloned);

   do_print("Multiple extend");

   let multiExtend1 = {a: 1, b: 2};

   let multiExtend2 = {c: 3, d: 4};

   let multiExtend3 = {b: 5, e: 6};

   let multiExtend4 = {e: 7, a: 8};

   let multiResult = Util.extend({}, multiExtend1, multiExtend2, multiExtend3, multiExtend4);

   do_check_true(multiResult.a === 8 && multiResult.b === 5 && multiResult.c === 3 && multiResult.d === 4 && multiResult.e === 7);

 }