## category.rb, using random data to find unknown edge cases
 minimum_example do
   set_name = Faker::Lorem.word
   sometimes { set_name = 'Materials' }

   {
     :name => Faker::Lorem.unique,
     :set_name => set_name
   }
 end

 ## product.rb model
 minimum_example do |attrs|
   # access the override attributes coming from the caller
   cat = attrs[:category] || example(:category)

   {
     # The category set_name is random, we might get a material
     :name => cat.is_material? ? nil : Faker::Lorem.unique,
     :category => cat,
     :material_type => cat.is_material? ? example(:material_type) : nil
   }
 end
 optional_example do |obj|
   # you can modify the object directly
    obj.color = 'blue'

   # or just return more attributes
   {
       :size => 23
   }
 end
 # anything_example will be alternate types of examples
 material_example do
   {
     :inv_category => example(:inv_category, :set_name => 'Materials'),
     :material_type => example(:material_type)
   }
 end
 bob_example { { :color => 'blue' }} #any name works

Product.material_example #use autogenerated examples
Product.bob_example
Product.example
Product.example(:category => nil)
Product.example(:category => nil, :save => false) # intantiate the object w/o saving

# use optional_example, for non-required attributes
Product.example(:category => nil, :full => true)

# a more complete example excerpt
should 'list unique purchase_quotes' do
  quote = Quote.example(:full => true)
  pq1 = PurchaseQuote.example
  pq2 = PurchaseQuote.example

  pq2.purchase_quote_items << PurchaseQuoteItem.example(:quotable => quote.quotables[0], :vendor => pq2.vendor)
  quote.quotables.each do |q|
    pq1.purchase_quote_items << PurchaseQuoteItem.example(:quotable => q, :vendor => pq1.vendor)
  end

  list = quote.purchase_quotes
  list2 = list.uniq
  assert_equal list2.size, list.size
end