| function shouldBe(actual, expected) { | |
| if (actual !== expected) | |
| throw new Error('bad value: ' + JSON.stringify(actual)); | |
| } | |
| function raw(array) { | |
| var result = ''; | |
| for (var i = 0; i < array.length; ++i) { | |
| result += array[i]; | |
| } | |
| return result; | |
| } | |
| function Counter() { | |
| return { | |
| count: 0, | |
| toString() { | |
| // Return a number even if the "toString" method. | |
| return this.count++; | |
| } | |
| }; | |
| } | |
| for (var i = 0; i < 10000; ++i) { | |
| var c = Counter(); | |
| shouldBe(raw([c, c]), "01"); | |
| } |