@Test
    public void testAccumulateOfDurationBetweenDateTime() {
        final String drl =
                "import java.time.Duration\n" +
                        "import " + Interval.class.getCanonicalName() + ";\n" +
                        "global java.util.List result; \n" +
                        "\n" +
                        "rule \"Rule1\"\n" +
                        "when\n" +
                        "    $count : Number() from accumulate(\n" +
                        "       Interval($start : start, $end : end), " +
                        "       sum(Duration.between($start, $end).toMinutes())  " +
                        "    ) " +
                        "then\n" +
                        "       result.add($count);\n" +
                        "end\n";

        List<Long> result = new ArrayList<>();

        KieSession ksession = getKieSession(drl);
        ksession.setGlobal("result", result);

        ksession.insert(new Interval(
                LocalDateTime.of(2020, 1, 22, 11, 43),
                LocalDateTime.of(2020, 1, 22, 12, 43)
        ));

        ksession.fireAllRules();

        assertEquals(60, result.iterator().next().longValue());

    }