How to export function from module without nodeunit testing it?

I've got a few tests scattered throughout multiple files.

Currently I just run `nodeunit .`, nodeunit then tests them all successfully. Great!

But I want to export a function from one of my files so that another can call it. The problem is that when I run `nodeunit .` that function now gets called.

How can I run tests on all files? I'm used to python's `nose` library, which only tests functions that have `test` in the function name.

Do I need to move all tests into a seperate file to the functionality? I don't want to do that. I like putting tests adjacent to the code they're testing.

首先阅读 nodeunit 在 `nodeunit .` 命令周围的测试发现和模块加载行为；issue 未指定任何源文件或测试。比较导出函数的处理方式与所需的相邻测试布局。完成的标准是，所有预期的测试仍然运行，且不会调用为复用而导出的辅助函数。

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