Add spec for OrderPopulator#attempt_cart_add

spec/models/order_populator_spec.rb

@@ -7,12 +7,11 @@ module Spree
     let(:params) { double(:params) }
     let(:distributor) { double(:distributor) }
     let(:order_cycle) { double(:order_cycle) }
+    let(:op) { OrderPopulator.new(order, currency) }
 
     describe "populate" do
 
       it "checks that distributor can supply all products in the cart" do
-        op = OrderPopulator.new(order, currency)
-
         op.should_receive(:load_distributor_and_order_cycle).with(params).
           and_return([distributor, order_cycle])
         op.should_receive(:distributor_can_supply_products_in_cart).with(distributor).
@@ -25,8 +24,6 @@ module Spree
       end
 
       it "doesn't set cart distributor and order cycle if populate fails" do
-        op = OrderPopulator.new(order, currency)
-
         op.should_receive(:load_distributor_and_order_cycle).with(params).
           and_return([distributor, order_cycle])
         op.should_receive(:distributor_can_supply_products_in_cart).with(distributor).
@@ -45,8 +42,6 @@ module Spree
       end
 
       it "sets cart distributor and order cycle when populate succeeds" do
-        op = OrderPopulator.new(order, currency)
-
         op.should_receive(:load_distributor_and_order_cycle).with(params).
           and_return([distributor, order_cycle])
         op.should_receive(:distributor_can_supply_products_in_cart).with(distributor).
@@ -54,16 +49,38 @@ module Spree
         op.should_receive(:populate_without_distribution_validation).with(params)
         op.should_receive(:set_cart_distributor_and_order_cycle).with(distributor, order_cycle)
 
-        op.populate(params).should be_true        
+        op.populate(params).should be_true
       end
     end
 
     describe "attempt_cart_add" do
-      it "validates distribution is provided"
-      it "validates variant is available under distributor"
+      it "performs additional validations" do
+        variant = double(:variant)
+        quantity = 123
+        Spree::Variant.stub(:find).and_return(variant)
+
+        op.should_receive(:check_stock_levels).with(variant, quantity).and_return(true)
+        op.should_receive(:check_distribution_provided_for).with(variant).and_return(true)
+        op.should_receive(:check_variant_available_under_distributor).with(variant).
+          and_return(true)
+        order.should_receive(:add_variant).with(variant, quantity, currency)
+
+        op.attempt_cart_add(333, quantity.to_s)
+      end
+    end
+
+    describe "support" do
+      it "loads distributor and order cycle from hash"
+      it "sets cart distributor and order cycle"
     end
 
     describe "validations" do
+      describe "determining if distributor can supply products in cart" do
+        it "returns true if no distributor is supplied"
+        it "returns true if the order can be changed to that distributor"
+        it "returns false otherwise"
+      end
+
       describe "checking distribution is provided for a variant" do
       end