I kept getting these 4 errors:
`Failures:

1. ProductsController POST create creates a new product
   Failure/Error: post :create, product: @product_attributes

   ThreadError:
   already initialized

   ./spec/controllers/products_controller_spec.rb:12:in `block (3 levels) in <top (required)>'

2. ProductsController GET inventory returns true or false appropriately
   Failure/Error: get :inventory, id: p1.id

   ThreadError:
   already initialized

   ./spec/controllers/products_controller_spec.rb:23:in `block (3 levels) in <top (required)>'

3. ProductsController GET description returns the description as a plain string
   Failure/Error: get :description, id: product.id

   ThreadError:
   already initialized

   ./spec/controllers/products_controller_spec.rb:33:in `block (3 levels) in <top (required)>'

4. ProductsController GET show returns a JSON representation of the product
   Failure/Error: get :show, id: product.id, format: 'json'

   ThreadError:
   already initialized

   ./spec/controllers/products_controller_spec.rb:41:in `block (3 levels) in <top (required)>'

Finished in 6.08 seconds (files took 2.67 seconds to load)
15 examples, 4 failures`

After removing the version '~> 4.2' from rails in the gemfile, deleting gemfile.lock, and running bundle, errors were gone and all tests passed. I hope this helps someone who has the same issue!

Hello -- I am working on this lab and the earlier labs with Ubuntu, and keep reaching the error --

1.2) Failure/Error:
        raise Dependency::NotFound.new(
          "Could not find an executable #{@executables} on your path.")

      Cliver::Dependency::NotFound:
        Could not find an executable ["phantomjs"] on your path.

I believe there is a chance that this gem does not work on Ubuntu.
(colszowka/phantomjs-gem#99)

Error: 1) invoices_index_view renders the invoice partial
Failure/Error: Product.create(:name => products.sample, :price => Faker::Number.between(1,1500))
ArgumentError:
wrong number of arguments (given 2, expected 0)

Previous:
Product.create(:name => products.sample, :price => Faker::Number.between(1,1500))

Fix:
Product.create(:name => products.sample, :price => Faker::Number.between(from: 1,to: 1500))