But why would you use a standard hash? If you follow recommendations from omniauth's guide and do this, no changes will be neccessary at all (`[:provider]`, `['provider']` and `.provider` will all work):
```ruby
OmniAuth.config.mock_auth[:twitter] = OmniAuth::AuthHash.new({
    :provider => 'twitter',
    :uid => '123545'
  })
```