rails rspec controller/model testing oauth

I'm trying to test oauth in controller, but I got stuck. How can I test my create method properly?

routes.rb

get '/auth/:provider/callback', to: 'socials#create'
resources :socials, only: :create

social.rb

def self.find_or_create_from_auth_hash(auth_hash)
  #checking if the connected account exists (one user can have one acc/provider at the moment)
  social_acc = where(provider: auth_hash.provider).first_or_create
  social_acc.update(
    uid: auth_hash.uid,
    token: auth_hash.credentials.token,
    secret: auth_hash.credentials.secret,
    picture_url: auth_hash.info.image,
    location: auth_hash.info.location,
    description: auth_hash.info.description,
    first_name: auth_hash.info.first_name || nil,
    last_name: auth_hash.info.last_name || nil,
    phone: auth_hash.info.phone || nil,
    page_url:   case social_acc.provider
                when 'twitter' then auth_hash.info.urls.Twitter
                when 'linkedin' then auth_hash.info.urls.public_profile
                end
    )
  social_acc
end

socials_controller

def create
  begin
    @profile = current_user.profile
    @social = @profile.socials.find_or_create_from_auth_hash(auth_hash)
    flash[:success] = "#{@social.provider.camelize} account was successfully updated!"
  rescue
    flash[:alert] = "There was an error while trying to authenticate you!"
  end
  redirect_to request.env['omniauth.origin'] || edit_user_profile_path(current_user)
end

private

  def auth_hash
    request.env['omniauth.auth']
  end

socials_controller_spec.rb

describe "when user is logged in" do
before(:each) do
  login_user
end

describe "POST create" do
  let!(:profile) { create(:profile, user: @user) }
  let!(:social) { create(:social, profile: profile) }
  #Not sure if I have to create auth_hash factory and if so then how.

  it "creates or updates social" do
    post :create
    expect(assigns(:profile)).to eq(profile)
    #########I don't know what I should put here:
    #expect(assigns(:profile)).to eq(receive)
    #expect(@profile).to receive(:find_or_create_from_auth_hash)
  end
end

end