Commits on Jan 10, 2020

1. Throw a descriptive error when a non-function is given to a runnable …

   Given a test such as:
   
   ```js
   it('foobars', 4);
   ```
   
   mocha used to throw the following error: `fn.call is not a function`.
   
   While technically true, I have personally spent some minutes of my life chasing
   what looked like a bug in the test itself, and not in the call to `it`. A more
   descriptive error message helps bring attention to where the problem originates.
   
   (Thanks to [ssube](https://github.com/ssube) for helping with the error wording.)

   

   Zirak committed Jan 10, 2020
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