Adding tests for the notification of the waiting list

app/models/spree/variant_decorator.rb

@@ -1,12 +1,13 @@
 module Spree
-
   Variant.class_eval do
     has_many :stock_requests
 
+    def waiting_list
+      stock_requests.notified(false)
+    end
+
     def notify_waiting_list
-      stock_requests.notified(false).each &:notify!
-      product.notify_waiting_list
+      waiting_list.each &:notify!
     end
   end
-
 end

lib/spree_waiting_list/factories.rb

@@ -1,7 +1,7 @@
 FactoryGirl.define do
 
   factory :stock_request, class: Spree::StockRequest do
-    variant
+    variant { |s| s.association(:base_variant) }
     email '[email protected]'
   end
 

spec/models/spree/variant_spec.rb

@@ -1,9 +1,27 @@
 require 'spec_helper'
 
-module Spree
+describe Spree::Variant do
+  let(:variant) { create(:variant) }
 
-  describe Variant do
+  context 'with stock_request' do
+    before(:each) do
+      create(:stock_request, variant: variant)
+    end
 
-  end
+    it '#waiting_list' do
+      expect(variant.waiting_list.count).to eq(1)
+    end
+
+    context '#notify_waiting_list' do
+      it 'should notify the waiting list when some product get in the stock' do
+        expect(variant.total_on_hand).to eq(0)
+        expect(variant.waiting_list.count).to eq(1)
 
+        stockItem = Spree::StockItem.find_by!(variant: variant)
+        stockItem.adjust_count_on_hand(1)
+
+        expect(variant.waiting_list.count).to eq(0)
+      end
+    end
+  end
 end