DuplicateHost testHost = new DuplicateHost();
        testHost.setRegularName("www.test.com");
        testHost.setDuplicateHostName("test.com");
        testList.add(testHost);

        helper.setDuplicateHostList(testList);

        assertEquals(testList, helper.duplicateHostList);
        assertEquals(1, helper.duplicateHostList.size());
        assertEquals("www.test.com", helper.duplicateHostList.get(0).getRegularName());

        }
    }

    /**
     * Sets the list of duplicate host rules.
     *
     * @param duplicateHostList the list of duplicate host rules to use
     */
    public void setDuplicateHostList(final List<DuplicateHost> duplicateHostList) {
        this.duplicateHostList = duplicateHostList;
    }

    /**
     * Adds a new duplicate host rule to the list.
     * Initializes the list if it doesn't exist.