Login a User programatically with ng-token-auth.

login_helper.rb

def login_user_programatically
  # User or whatever the name of the model is that you're trying to authenticate
  @request.env['devise.mapping'] = Devise.mappings[:user]
  @resource = FactoryGirl.create(:confirmed_user)
  # The following two lines are where the magic happens.
  @auth_headers = @resource.create_new_auth_token
  @request.headers.merge!(@auth_headers)
end