unit test in rails - model with paperclip

Adding file to a model is dead simple. For example:

@post = Post.new@post.attachment = File.new("test/fixtures/sample_file.png")# Replace attachment= with the name of your paperclip attachment

In that case you should put the file into your test/fixtures dir.

I usually make a little helper in my test_helper.rb

def sample_file(filename = "sample_file.png")  File.new("test/fixtures/#{filename}")end

Then

@post.attachment = sample_file("filename.txt")

If you use something like Factory Girl instead of fixtures this becomes even easier.

This is in Rspec, but can be easily switched over

before do # setup  @file = File.new(File.join(RAILS_ROOT, "/spec/fixtures/paperclip", "photo.jpg"), 'rb')  @model = Model.create!(@valid_attributes.merge(:photo => @file))endit "should receive photo_file_name from :photo" do # def .... || should ....  @model.photo_file_name.should == "photo.jpg"  # assert_equal "photo.jpg", @model.photo_file_nameend

Since Paperclip is pretty well tested, I usually don't focus too much on the act of "uploading", unless i'm doing something out of the ordinary. But I will try to focus more on ensuring that the configurations of the attachment, in relation to the model it belongs, meet my needs.

it "should have an attachment :path of :rails_root/path/:basename.:extension" do  Model.attachment_definitions[:photo][:path].should == ":rails_root/path/:basename.:extension"  # assert_equal ":rails_root/path/:basename.:extension", Model.attachment_definitions[:photo][:path]end

All the goodies can be found in Model.attachment_definitions.

I use FactoryGirl, setup the Model.

#photos.rbFactoryGirl.define do  factory :photo do    image File.new(File.join(Rails.root, 'spec', 'fixtures', 'files', 'testimg1.jpg'))  description "testimg1 description"  end # factory :photo end

then

 # in specbefore(:each) { @user = FactoryGirl.create(:user, :with_photo) }

In the paperclip attachment specify where its going to be saved i.e.

...the_path= "/:user_id/:basename.:extension"if Rails.env.test?   the_path= ":rails_root/tmp/" + the_pathendhas_attached_file :image,  :default_url => ActionController::Base.helpers.asset_path('missing.png'),:path => the_path, :url => ':s3_domain_url'Paperclip.interpolates :user_id do |attachment, style|   attachment.instance.user_id.to_send

...

then test both the attachment_definitions (as suggested by kwon) and the Dir.glob to check the file is saved

 it "saves in path of user.id/filename" do    expect(Dir.glob(File.join(Rails.root, 'tmp', @user.id.to_s, @user.photo.image.instance.image_file_name)).empty?).to be(false) end

this way i'm sure its carrying out the correct directy/path create etc