item_spec.rb

describe Item do
  it { should validate_presence_of(:name) }
  it { should validate_presence_of(:price_in_dollars) }
  it { should validate_numericality_of(:price_in_dollars, :allow_blank => true) }
  it { should validate_attachment_presence(:photo) }
  it { should validate_length_of(:name, :maximum => 255) }
  it { should belong_to(:user) }
end