Further clarify that updating default card does not delete cards

Author: jim-stripe

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

@@ -356,6 +356,7 @@ public void testCustomerCardAddition() throws StripeException {
 		Map<String, Object> updateParams = new HashMap<String, Object>();
 		updateParams.put("default_card", addedCard.getId());
 		Customer customerAfterDefaultCardUpdate = updatedCustomer.update(updateParams);
+		assertEquals((Integer) customerAfterDefaultCardUpdate.getCards().getData().size(), (Integer) 3);
 		assertEquals(customerAfterDefaultCardUpdate.getDefaultCard(), addedCard.getId());
 	}