ActionDispatch::Http::UploadedFile being passed as a string during integration test - ruby-on-rails

Question

I have an Album model and a child Picture model, whereby a file upload is handled by carrierwave.
The app runs as intended, however fails when I try to write an integration test for the upload.
From the development log, working parameters for this appear as follows:
Parameters: ..., "images"=>[#<ActionDispatch::Http::UploadedFile:0x007f8a42be2c78>...
During the integration test, im getting parameters as follows:
Parameters: ..., "images"=>["#<ActionDispatch::Http::UploadedFile:0x00000004706fd0>"...
As you can see, in the test scenario, #<ActionDispatch::Http::UploadedFile is being passed through as a string (confirmed with byebug), which is causing the test to fail.
How do I get the test to pass this as the object?
Integration Test
require 'test_helper'
class AlbumsCreationTest < ActionDispatch::IntegrationTest
def setup
#user = users(:archer)
#file ||= File.open(File.expand_path(Rails.root + 'test/fixtures/cat1.jpg', __FILE__))
#testfile ||= uploaded_file_object(PicturesUploader, :image, #file)
end
test "should create new album with valid info" do
log_in_as(#user)
assert_difference 'Album.count', 1 do #This assertion fails
post user_albums_path(#user), album: { title: 'test',
description: 'test',
}, images: [#testfile]
end
assert_redirected_to #user
end
end
from test_helper.rb
# Upload File (Carrierwave) Ref: http://nicholshayes.co.uk/blog/?p=405
def uploaded_file_object(klass, attribute, file, content_type = 'image/jpeg')
filename = File.basename(file.path)
klass_label = klass.to_s.underscore
ActionDispatch::Http::UploadedFile.new(
tempfile: file,
filename: filename,
head: %Q{Content-Disposition: form-data; name="#{klass_label}[#{attribute}]"; filename="#{filename}"},
type: content_type
)
end
Models
class Album < ActiveRecord::Base
belongs_to :user
has_many :pictures, dependent: :destroy
accepts_nested_attributes_for :pictures, allow_destroy: true
validates_presence_of :pictures
end
class Picture < ActiveRecord::Base
belongs_to :album
mount_uploader :image, PicturesUploader
validates_integrity_of :image
validates_processing_of :image
validates :image, presence: true,
file_size: { less_than: 10.megabytes }
end
Controller
class AlbumsController < ApplicationController
before_action :valid_user, only: [:new, :create, :edit, :update, :destroy]
def create
#album = current_user.albums.build(album_params)
if params[:images]
params[:images].each { |file|
debugger #file.class is String in integration test
#album.pictures.build(image: file)
}
end
if #album.save
# end
flash[:success] = "Album Created!"
redirect_to current_user
else
flash[:alert] = "Something went wrong."
render :new
end
end
private
def album_params
params.require(:album).permit(:user_id, :title, :description, :price,
pictures_attributes: [:id, :image, :image_cache, :_destroy])
end
def valid_user
#user = User.friendly.find(params[:user_id])
redirect_to(root_url) unless #user == current_user
end
end

Answer 1

Solved:
It appears that the uploaded_file_object method doesn't work at the integration test level.
I went back to using fixture_file_upload and everything works as intended.