Can't figure out what's causing my tests to fail - ruby-on-rails

Question

I'm new to rails and I built an app without doing TDD but am now going back and trying to pass all the tests. I've passed most of them but there are a few left relating to the same issue that I can't figure out. The app functions correctly as well, I just can't pass these tests.
The tests fail and provide this:
1) ProductsController POST create with valid params assigns a newly created product as #product
Failure/Error: post :create, {:product => valid_attributes}, valid_session
Paperclip::AdapterRegistry::NoHandlerError:
No handler found for "#<File:0x007fc6d17b28f8>"
# ./app/controllers/products_controller.rb:43:in `new'
# ./app/controllers/products_controller.rb:43:in `create'
# ./spec/controllers/products_controller_spec.rb:86:in `block (4 levels) in <top (required)>'
2) ProductsController POST create with valid params creates a new Product
Failure/Error: post :create, {:product => valid_attributes}, valid_session
Paperclip::AdapterRegistry::NoHandlerError:
No handler found for "#<File:0x007fc6d1757cf0>"
# ./app/controllers/products_controller.rb:43:in `new'
# ./app/controllers/products_controller.rb:43:in `create'
# ./spec/controllers/products_controller_spec.rb:81:in `block (5 levels) in <top (required)>'
# ./spec/controllers/products_controller_spec.rb:80:in `block (4 levels) in <top (required)>'
3) ProductsController POST create with valid params redirects to the created product
Failure/Error: post :create, {:product => valid_attributes}, valid_session
Paperclip::AdapterRegistry::NoHandlerError:
No handler found for "#<File:0x007fc6d36b3dd8>"
# ./app/controllers/products_controller.rb:43:in `new'
# ./app/controllers/products_controller.rb:43:in `create'
# ./spec/controllers/products_controller_spec.rb:92:in `block (4 levels) in <top (required)>'
The "create" method in my controller:
def create
#product = Product.new(params[:product])
respond_to do |format|
if #product.save
format.html { redirect_to admin_path, notice: 'Product was successfully created.' }
format.json { render json: #product, status: :created, location: #product }
else
format.html { render action: "new" }
format.json { render json: #product.errors, status: :unprocessable_entity }
end
end
end
My Model:
class Product < ActiveRecord::Base
attr_accessible :designed, :features, :photo, :manufactured, :name, :case_study
has_attached_file :photo, {
:styles => {
:thumb => "x50>",
:small => "x150>",
:detail => "x600>"
}
}.merge(PAPERCLIP_STORAGE_OPTIONS)
validates_attachment_presence :photo
validates_attachment_size :photo, :less_than => 5.megabytes
validates_attachment_content_type :photo, :content_type => ['image/jpeg', 'image/png']
end
My test:
before(:each) do
#image = File.new(Rails.root + 'spec/fixtures/images/test.png')
end
def valid_attributes
{ "photo" => #image }
end
describe "POST create" do
describe "with valid params" do
it "creates a new Product" do
expect {
post :create, {:product => valid_attributes}, valid_session
}.to change(Product, :count).by(1)
end
it "assigns a newly created product as #product" do
post :create, {:product => valid_attributes}, valid_session
assigns(:product).should be_a(Product)
assigns(:product).should be_persisted
end
it "redirects to the created product" do
post :create, {:product => valid_attributes}, valid_session
response.should redirect_to(admin_path)
end
end
end

Answer 1

If you're using Rails 3.2, try sending an UploadedFile instead of File in your tests. UploadedFile takes a filename, and a content-type in its initializer.
before(:each) do
#image = Rack::Test::UploadedFile.new(Rails.root.join('spec/fixtures/images/test.png'), 'image/png')
end
You might have to include Rack::Test::Methods in your test or test helper.

Answer 2

You can also use fixture_file_upload as a shortcut to Rack::Test::UploadedFile.new like this:
post :create, product: { photo: fixture_file_upload('spec/fixtures/images/test.png', 'image/png') }

Answer 3

Have you added the Paperclip attachment to your databases -- eg created and run migrations? Including the test database?