diff --git a/spec/models/order_item_spec.rb b/spec/models/order_item_spec.rb
index a2be719..72a2cb6 100644
--- a/spec/models/order_item_spec.rb
+++ b/spec/models/order_item_spec.rb
@@ -13,6 +13,7 @@ describe OrderItem do
     order_item = create :order_item
     expect(order_item).to be_valid
   end
+
   ############
   #  FIELDS  #
   ############
diff --git a/spec/models/order_spec.rb b/spec/models/order_spec.rb
index 380541f..373471c 100644
--- a/spec/models/order_spec.rb
+++ b/spec/models/order_spec.rb
@@ -20,16 +20,58 @@ describe Order do
     expect(@order).to be_valid
   end
 
-  describe 'price' do
-    it 'should be calculated from order_items' do
-      @order = build :order, products_count: 0
-      sum = (create_list :product, 1 + rand(10)).map do |p|
-        create(:order_item, order: @order, product: p, count: 1 + rand(5)) do |oi|
-          @order.order_items << oi
-        end
-      end.map{ |oi| oi.count * oi.product.price_cents }.sum
-      @order.valid?
-      expect(@order.price_cents).to eq(sum)
+  ############
+  #  FIELDS  #
+  ############
+
+  describe 'fields' do
+    describe 'user' do
+      it { Order.reflect_on_association(:user).macro.should eq(:belongs_to) }
+      it 'should be present' do
+        @order.user = nil
+        expect(@order).to_not be_valid
+      end
+    end
+
+    describe 'price_cents' do
+      it 'should be calculated from order_items' do
+        @order = build :order, products_count: 0
+        sum = (create_list :product, 1 + rand(10)).map do |p|
+          create(:order_item, order: @order, product: p, count: 1 + rand(5)) do |oi|
+            @order.order_items << oi
+          end
+        end.map{ |oi| oi.count * oi.product.price_cents }.sum
+        @order.save
+        expect(@order.price_cents).to eq(sum)
+      end
+    end
+
+    describe 'order_items' do
+      it 'should be validated' do
+        @order.order_items << OrderItem.new(count: -5)
+        expect(@order).to_not be_valid
+      end
+    end
+
+    describe 'products' do
+      it 'should be present' do
+        @order.products.clear
+        expect(@order).to_not be_valid
+      end
     end
   end
+
+  ###############
+  #  CALLBACKS  #
+  ###############
+
+  describe 'empty order_items' do
+    it 'should be removed' do
+      product = create :product
+      @order.order_items << create(:order_item, order: @order, product: product, count: 0)
+      @order.save
+      expect(@order.order_items.where(product: product)).to be_empty
+    end
+  end
+
 end