add some rspec tests for supplier and article

spec/factories/article.rb

@@ -0,0 +1,20 @@
+require 'factory_girl'
+
+FactoryGirl.define do
+
+  factory :article do
+    name { Faker::Lorem.words(rand(2..5)).join(' ') }
+    unit { Faker::Unit.unit }
+    price { rand(2600) / 100 }
+    tax { [6, 21].sample }
+    deposit { rand(10) < 8 ? 0 : [0.0, 0.80, 1.20, 12.00].sample }
+    unit_quantity { rand(5) < 3 ? 1 : rand(1..20) }
+    #supplier_id
+    article_category { FactoryGirl.create :article_category }
+  end
+
+  factory :article_category do
+    name { Faker::Lorem.characters(rand(2..20)) }
+  end
+
+end