Integration test methods such as ActionDispatch::Integration::Session#get and ActionDispatch::Integration::Session#post return objects of class TestResponse, which represent the HTTP response results of the requested controller actions.

See Response for more information on controller response objects.

Methods
F
Class Public methods
from_response(response)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/testing/test_response.rb, line 9
def self.from_response(response)
  new.tap do |resp|
    resp.status  = response.status
    resp.headers = response.headers
    resp.body    = response.body
  end
end