I don't understand the difference between "test mode" and "dev mode".  Should "dev mode" instead be "prod_mode"?

Hmm.  I don't think "prod_mode" helps much here either.

What we're trying to do is turn test mode on and off.  How about modifying to:

```ruby
LoadConfig.set_test_mode(true)
```

and to reset test mode you pass, ahem, `false`.

I like that much better.  What do you think?