For past versions of Devise, you could include DeviseHelpers as part of
controller or request type tests to have access to the sign_in and
sign_out helpers.
RSpec.configure do |config|
config.include Devise::TestHelpers, :type => :controller
endAs of Devise
4.2.0+,
the Devise::TestHelpers have been deprecated. The
Devise::Test::ControllerHelpers module should instead be included.
RSpec.configure do |config|
config.include Devise::Test::ControllerHelpers, :type => :controller
end