@Test
 public void testExecute_purchaseBooks_EmptyRequest() throws Exception {
   setupForExpectedAssertionFailure("PurchaseRequestMessage");
   PurchaseRequestMessage purchaseRequestMessage =
       Bookshop2Fixture.createEmpty_PurchaseRequestMessage();
   setupContext("dummyCorrelationId", "dummyTransactionId");
   setupMessage(purchaseRequestMessage);
   isExpectedValidationError = true;
   runTestExecute_purchaseBooks(purchaseRequestMessage);
 }