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OmniAuth has some facilities for mocking its authentication flow when you are performing integration tests. Here's how it works.

OmniAuth.config.test_mode

You can turn on "test mode" for OmniAuth like so:

    OmniAuth.config.test_mode = true

Once you have enabled test mode, all requests to OmniAuth will be short circuited to use the mock authentication hash as described below. A request to /auth/provider will redirect immediately to /auth/provider/callback.

OmniAuth.config.mock_auth

The mock_auth configuration allows you to set per-provider (or default) authentication hashes to return during integration testing. You can set it like so:

    OmniAuth.config.mock_auth[:twitter] = OmniAuth::AuthHash.new({
      :provider => 'twitter',
      :uid => '123545'
      # etc.
    })

You can set the :default key to return a hash for providers that haven't been specified. Once you set the mock auth hash and turn on test mode, all requests to OmniAuth will return an auth hash from the mock.

OmniAuth.config.add_mock

You can also use the shortcut #add_mock method to quickly add a new mock provider. This information will automatically be merged with the default info so it will be a valid response.

OmniAuth.config.add_mock(:twitter, {:uid => '12345'})

Mocking Failure

If you set a provider's mock to a symbol instead of a hash, it will fail with that message.

OmniAuth.config.mock_auth[:twitter] = :invalid_credentials

You will be redirected back to /auth/failure?message=invalid_credentials

Setting up the controller

When you try to test the OmniAuth, you need to set two env variables, see the sample below using RSpec and Twitter OmniAuth:

before do 
  request.env["devise.mapping"] = Devise.mappings[:user] 
  request.env["omniauth.auth"] = OmniAuth.config.mock_auth[:twitter] 
end

This prevents the route error, see the sample below

  Failure/Error: get :twitter
  AbstractController::ActionNotFound:
    Could not find devise mapping for path "/users/auth/twitter/callback".
    Maybe you forgot to wrap your route inside the scope block? For example:
      devise_scope :user do
        match "/some/route" => "some_devise_controller"
      end
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