def METHOD_NAME(self):
    """Shorten interval to zero"""
    self.t("track 2016-06-08T07:30:00Z - 2016-06-08T07:35:00Z foo")
    self.t("shorten @1 5mins")
    j = self.t.export()
    self.assertEqual(len(j), 1)
    self.assertClosedInterval(j[0],
                              expectedStart="20160608T073000Z",
                              expectedEnd="20160608T073000Z")