Olivine-Labs/busted — pull request #308 by naartjie (2014-12-18 12:36:26+00:00)
Title: example should just return has_key

Using
```lua
return has_key
```
Works as expected with `is_not` negative assertions.

The original code:
```lua
return state.mod == has_key
```
doesn't work for negated assertions.