Functional testing devise user with custom roles ,rspec

I have user model with role field for user,admin and super admin which are in enum roles. I wrote function in controller_macros.rb for super admin sign in:

def login_super_admin
  before(:each) do
    @request.env["devise.mapping"] = Devise.mappings[:admin]
    sign_in = FactoryGirl.create(:user, :super_admin)
  end
end

And i have this test:

context "As super admin" do
  login_super_admin
  it "renders new page" do
    get :new
    expect(response).to be_success
  end
end

This tests response code is 302, i can't figure out why, i think it never reaches controller new action, because i placed debugger to catch it. Why this happens?