    @Test
    public void getDOI_inInput_shouldWork() {

        String input = "{\"reference-count\":176,\"publisher\":\"IOP Publishing\",\"issue\":\"4\",\"content-domain\":{\"domain\":[],\"crossmark-restriction\":false},\"short-container-title\":[\"Russ. Chem. Rev.\"],\"published-print\":{\"date-parts\":[[1998,4,30]]},\"DOI\":\"10.1070/rc1998v067n04abeh000372\",\"type\":\"journal-article\",\"created\":{\"date-parts\":[[2002,8,24]],\"date-time\":\"2002-08-24T21:29:52Z\",\"timestamp\":{\"$numberLong\":\"1030224592000\"}},\"page\":\"279-293\",\"source\":\"Crossref\",\"is-referenced-by-count\":24,\"title\":[\"Haloalkenes activated by geminal groups in reactions with N-nucleophiles\"],\"prefix\":\"10.1070\",\"volume\":\"67\",\"author\":[{\"given\":\"Alexander Yu\",\"family\":\"Rulev\",\"sequence\":\"first\",\"affiliation\":[]}],\"member\":\"266\",\"published-online\":{\"date-parts\":[[2007,10,17]]},\"container-title\":[\"Russian Chemical Reviews\"],\"deposited\":{\"date-parts\":[[2017,11,23]],\"date-time\":\"2017-11-23T03:38:45Z\",\"timestamp\":{\"$numberLong\":\"1511408325000\"}},\"score\":1,\"issued\":{\"date-parts\":[[1998,4,30]]},\"references-count\":176,\"journal-issue\":{\"published-print\":{\"date-parts\":[[1998,4,30]]},\"issue\":\"4\"},\"URL\":\"http://dx.doi.org/10.1070/rc1998v067n04abeh000372\",\"ISSN\":[\"0036-021X\",\"1468-4837\"],\"issn-type\":[{\"value\":\"0036-021X\",\"type\":\"print\"},{\"value\":\"1468-4837\",\"type\":\"electronic\"}]}";
        String doi = "10.1070/rc1998v067n04abeh000372";

        String output = target.fetchDOI(input);

        assertThat(output, is(doi));
    }