def METHOD_NAME(self):
    """Verify that 'start' creates an open interval"""
    code, out, err = self.t.runError("")
    self.assertIn("There is no active time tracking.", out)
    code, out, err = self.t("start tag1 tag2")
    self.assertIn("Tracking tag1 tag2\n", out)
    j = self.t.export()
    self.assertEqual(len(j), 1)
    self.assertOpenInterval(j[0], expectedTags=["tag1", "tag2"])