String url = "http://test.com";
        String result = helper.convert(url);

        assertEquals(url, result);
    }

    @Test
    public void test_convert_multipleTransformations() {
        DuplicateHostHelper helper = new DuplicateHostHelper();
        helper.duplicateHostList = new ArrayList<>();

        DuplicateHost host1 = new DuplicateHost();