ifError doesn't throw

I think the problem is that ifError assertion which is simply "if (error) throw error;" is getting wrapped by assertWrapper which contains a try/catch. This stops the throw from escaping and exiting the test method where it appears. Is it possible that the fix is simply to avoid wrapping the ifError assertion?

在 Nodeunit 源代码中定位 ifError 断言和 assertWrapper 的实现，然后跟踪该断言如何从测试方法中调用。如果现有测试未覆盖所报告的行为，请使用一个针对性测试重现该行为。完成的标准是 ifError 按预期传播错误，同时不破坏其他被包装的断言。

由索引模型根据 Issue 内容生成。