| function shouldBe(actual, expected) { |
| if (actual !== expected) |
| throw new Error('bad value: ' + actual); |
| } |
| |
| function shouldThrow(func, errorMessage) { |
| var errorThrown = false; |
| var error = null; |
| try { |
| func(); |
| } catch (e) { |
| errorThrown = true; |
| error = e; |
| } |
| if (!errorThrown) |
| throw new Error('not thrown'); |
| if (String(error) !== errorMessage) |
| throw new Error(`bad error: ${String(error)}`); |
| } |
| |
| let a = Array(2**32-1); |
| shouldThrow(() => { |
| a.push(0, 0); |
| }, `RangeError: Invalid array length`); |
| shouldBe(a.length, 2**32 - 1); |
| shouldBe(a[2**32], 0); |
| shouldBe(a[2**32 - 1], 0); |
| shouldBe(a[2**32 - 2], undefined); |