完善测试用例失败时的信息提示

类似与下面的 events.js, charset, 等具体信息的定位。
```
passed 10 of 16 tests in 13885ms
    specs/util - specs/util - events.js
    specs/config - specs/config - charset
    specs/module - specs/module - anywhere
    specs/package - specs/package - math
    specs/extensible - specs/extensible - combo-map
    specs/extensible/plugin-debug - specs/extensible/plugin-debug - specs/extensible/plugin-debug
```