HTML/DOC reporter regressions as a result of #2037

[danielstjules]

#2037

As a result of that PR, the browser & doc reporters cannot handle showing function bodies when exceptions are thrown async, outside of the duration of the originating suite (after the suite has ended). They'll result in: Uncaught TypeError: Cannot read property 'toString' of undefined

The line in question:

var pre = fragment('<pre><code>%e</code></pre>', utils.clean(test.fn.toString()));

Rather than revert #2037, I propose caching the function body strings, which should still be light.

[francisco-sanchez-molina]

Hi @danielstjules @boneskull! After test.fn.toString() to test.body change, when "before" throw Error mocha explode in mocha.js:5980 Uncaught TypeError: Cannot read property 'replace' of undefined

2.4.4 version http://jsfiddle.net/38v388kw/

2.3.4 version http://jsfiddle.net/joes4L1q/

[asadsahi]

any fix for this? having same issue.