lcov report has bad metrics when using sandbox

I tried producing a code coverage report using the lcov reporter. It works as long as I don't mess with the sandbox util.

I'm using the sandbox utility to replace 'require' and mock out modules used by the module under test.

I've been working really hard at trying different code coverage tools and different ways to mock.

Should I be mocking differently or is there a way we could fix the code coverage instrumentation?

首先使用 issue 中描述的 module-mocking 设置，在启用和禁用 sandbox 工具的情况下重现 lcov reporter 的输出。检查 lcov reporter 与 sandbox 的交互，以确定 mocking 改变的是 instrumentation，还是仅改变报告的指标。报告指标在使用 sandbox 时准确，或已明确确定受支持的 mocking 限制，即表示完成。

由索引模型根据 Issue 内容生成。