does this really verify the error message? As far as I know this only verifies the type of exception see the [minitest source](https://github.com/seattlerb/minitest/blob/master/lib/minitest/assertions.rb#L285)

to verify the message you can use:

```ruby
 e = assert_raise(LoadError) {}
 assert_equal "No such file to load -- very_invalid_file_name", e.message
```