Revert "Clearing out subscription code/tests from Customer."

This reverts commit d6ebab33109ff2501ba9709d2ac1dd666be0ab67.
We'll support the legacy single-subscription API style
indefinitely, and also we generaly try to make it so that
people can use modern bindings with out-of-date API versions.

lib/stripe/customer.rb

@@ -25,6 +25,18 @@ module Stripe
       Charge.all({ :customer => id }, @api_key)
     end
 
+    #def cancel_subscription(params={})
+    #  response, api_key = Stripe.request(:delete, subscription_url, @api_key, params)
+    #  refresh_from({ :subscription => response }, api_key, true)
+    #  subscription
+    #end
+
+    #def update_subscription(params)
+    #  response, api_key = Stripe.request(:post, subscription_url, @api_key, params)
+    #  refresh_from({ :subscription => response }, api_key, true)
+    #  subscription
+    #end
+
     def delete_discount
       Stripe.request(:delete, discount_url, @api_key)
       refresh_from({ :discount => nil }, api_key, true)
@@ -35,5 +47,9 @@ module Stripe
     def discount_url
       url + '/discount'
     end
+
+    def subscription_url
+      url + '/subscription'
+    end
   end
 end

test/stripe/customer_test.rb

@@ -32,6 +32,32 @@ module Stripe
       assert_equal "c_test_customer", c.id
     end
 
+    should "be able to update a customer's subscription" do
+      @mock.expects(:get).once.returns(test_response(test_customer))
+      c = Stripe::Customer.retrieve("test_customer")
+
+      @mock.expects(:post).once.with do |url, api_key, params|
+        url == "#{Stripe.api_base}/v1/customers/c_test_customer/subscription" && api_key.nil? && CGI.parse(params) == {'plan' => ['silver']}
+      end.returns(test_response(test_subscription('silver')))
+      s = c.update_subscription({:plan => 'silver'})
+
+      assert_equal 'subscription', s.object
+      assert_equal 'silver', s.plan.identifier
+    end
+
+    should "be able to cancel a customer's subscription" do
+      @mock.expects(:get).once.returns(test_response(test_customer))
+      c = Stripe::Customer.retrieve("test_customer")
+
+      # Not an accurate response, but whatever
+
+      @mock.expects(:delete).once.with("#{Stripe.api_base}/v1/customers/c_test_customer/subscription?at_period_end=true", nil, nil).returns(test_response(test_subscription('silver')))
+      c.cancel_subscription({:at_period_end => 'true'})
+
+      @mock.expects(:delete).once.with("#{Stripe.api_base}/v1/customers/c_test_customer/subscription", nil, nil).returns(test_response(test_subscription('silver')))
+      c.cancel_subscription
+    end
+
     should "be able to delete a customer's discount" do
       @mock.expects(:get).once.returns(test_response(test_customer))
       c = Stripe::Customer.retrieve("test_customer")