def METHOD_NAME(self):
    name_observed = "Εργατική Πρωτομαγιά (παρατηρήθηκε)"
    dt = (
        "2011-05-02",
        "2016-05-03",
        "2021-05-04",
        "2022-05-02",
    )
    self.assertHolidayName(name_observed, dt)
    self.assertNoNonObservedHoliday(dt)
    self.assertNoHolidayName(name_observed, 2017, 2018, 2019, 2020, 2023)