El testCheckOut1falla

[guillermo-ag-95]

2015-11-15 17:39:13,697 [main] WARN org.springframework.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springfra
mework.test.context.transaction.TransactionalTestExecutionListener@29d065c1] to process 'after' execution for test: method [public void services.ShoppingCartSer
viceTest.testCheckOut1()], instance [services.ShoppingCartServiceTest@30c87759], exception [java.lang.IllegalArgumentException: [Assertion failed] - this argume
nt is required; it must not be null]

[ManuelLR]

Solucionado en @da8e739310eb1c7ca2b2f6a84e9f67b4cb1e80f2