Implement spring and reset counters functionality

spec/models/supplier_spec.rb

@@ -2,6 +2,32 @@ require 'spec_helper'
 
 describe Supplier do
   let(:supplier){ build :supplier }
+
+  describe '.reset_counters!' do
+    it 'sets the counters to the right values' do
+      supplier1 = create :supplier
+      supplier2 = create :supplier
+      create_list :order, 2, :placed, supplier: supplier1
+      create_list :order, 7, :active, supplier: supplier1
+      create_list :order, 3, :placed, supplier: supplier2
+      Supplier.reset_counters!
+      supplier1.orders_in_process_count.should == 2
+      supplier1.orders_delivered_count.should == 7
+      supplier2.orders_in_process_count.should == 3
+    end
+  end
+
+  describe '#reset_counters!' do
+    it 'sets the counters to the right values' do
+      supplier = create :supplier
+      create_list :order, 5, :placed, supplier: supplier
+      create_list :order, 9, :active, supplier: supplier
+      supplier.reset_counters!
+      supplier.orders_in_process_count.should == 5
+      supplier.orders_delivered_count.should == 9
+    end
+  end
+
   # property open
   describe :open do
     it 'should be false by default' do