@Test
    public void exceptionThrownIfCoreBudgetItemListIsNullWithinFormData() throws Exception {

        when(budgetFormData.getCoreBudgetItemsList()).thenReturn(null);

        try {
            budget.buildBudget(budgetFormData);
            fail("CoreBudgetItemList is null.");
        } catch (Exception e) {
            System.out.println("CoreBudgetItemList is null.");
        }

    }