Fix return type of CustomerCardCollection.retrieve, add a test

Author: jim-stripe

src/main/java/com/stripe/model/CustomerCardCollection.java

@@ -43,19 +43,19 @@ public CustomerCardCollection all(Map<String, Object> params,
         CustomerCardCollection.class, apiKey);
   }
 
-  public CustomerCardCollection retrieve(String id)
+  public Card retrieve(String id)
       throws AuthenticationException, InvalidRequestException,
       APIConnectionException, CardException, APIException {
     return retrieve(id, null);
   }
 
-  public CustomerCardCollection retrieve(String id, String apiKey) throws AuthenticationException,
+  public Card retrieve(String id, String apiKey) throws AuthenticationException,
       InvalidRequestException, APIConnectionException, CardException,
       APIException {
         // TODO: URL-encode!
     String url = String.format("%s%s/%s", Stripe.API_BASE, this.getURL(), id);
     return request(RequestMethod.GET, url, null,
-        CustomerCardCollection.class, apiKey);
+        Card.class, apiKey);
   }
 
   public CustomerCardCollection create(Map<String, Object> params)

src/test/java/com/stripe/StripeTest.java

@@ -366,6 +366,9 @@ public void testCustomerCardAddition() throws StripeException {
 		Customer customerAfterDefaultCardUpdate = updatedCustomer.update(updateParams);
 		assertEquals((Integer) customerAfterDefaultCardUpdate.getCards().getData().size(), (Integer) 3);
 		assertEquals(customerAfterDefaultCardUpdate.getDefaultCard(), addedCard.getId());
+
+		assertEquals(customerAfterDefaultCardUpdate.getCards().retrieve(originalDefaultCard).getId(), originalDefaultCard);
+		assertEquals(customerAfterDefaultCardUpdate.getCards().retrieve(addedCard.getId()).getId(), addedCard.getId());
 	}
 
 	@Test