The Tor Browser / file revision

 function test1() {

     function push(arr, x) {

         return arr.push(x);

     }

     var arr = [];

     for (var i=0; i<100; i++) {

         assertEq(push(arr, i), i + 1);

     }

 }

 test1();

 function test2() {

     var arr;

     for (var i=0; i<60; i++) {

         arr = [];

         assertEq(arr.push(3.3), 1);

         assertEq(arr.push(undefined), 2);

         assertEq(arr.push(true), 3);

         assertEq(arr.push(Math), 4);

         assertEq(arr.toString(), "3.3,,true,[object Math]");

     }

 }

 test2();

 function test3() {

     function push(arr, v) {

         arr.push(v);

     }

     for (var i=0; i<60; i++) {

         var arr = [];

         push(arr, null);

         push(arr, 3.14);

         push(arr, {});

         assertEq(arr.toString(), ",3.14,[object Object]");

     }

 }

 test3();