Add Enterprise#ready_for_checkout?

app/models/enterprise.rb

@@ -277,6 +277,10 @@ class Enterprise < ActiveRecord::Base
       select('DISTINCT spree_taxons.*')
   end
 
+  def ready_for_checkout?
+    shipping_methods.any? && payment_methods.available.any?
+  end
+
   def shop_trial_in_progress?
     !!shop_trial_start_date &&
     (shop_trial_start_date + SHOP_TRIAL_LENGTH.days > Time.now) &&

spec/models/enterprise_spec.rb

@@ -219,6 +219,32 @@ describe Enterprise do
       end
     end
 
+    describe "#ready_for_checkout?" do
+      let!(:e) { create(:enterprise) }
+
+      it "returns false for enterprises with no payment methods" do
+        create(:shipping_method, distributors: [e])
+        e.reload.should_not be_ready_for_checkout
+      end
+
+      it "returns false for enterprises with no shipping methods" do
+        create(:payment_method, distributors: [e])
+        e.reload.should_not be_ready_for_checkout
+      end
+
+      it "returns false for enterprises with unavailable payment methods" do
+        create(:shipping_method, distributors: [e])
+        create(:payment_method, distributors: [e], active: false)
+        e.reload.should_not be_ready_for_checkout
+      end
+
+      it "returns true for enterprises with available payment and shipping methods" do
+        create(:shipping_method, distributors: [e])
+        create(:payment_method, distributors: [e])
+        e.reload.should be_ready_for_checkout
+      end
+    end
+
     describe "distributors_with_active_order_cycles" do
       it "finds active distributors by order cycles" do
         s = create(:supplier_enterprise)