bblimke/webmock — pull request #275 by hsume2 (2013-04-08 17:29:11+00:00)
Title: Adds support for invoking the `on_error` handler.

Adds support for `to_errback`:

```ruby
stub_request(:get, "www.example.com").to_errback
```

Which will then invoke the `on_error` handler.