def METHOD_NAME(self):
    covars = [Covar3d(7), Covar3f(7)]
    l = LandmarkF()
    # check default
    numpy.testing.assert_array_equal(l.covariance.matrix(), Covar3d().matrix())
    # set type-aligned covariance
    l.covariance = covars[1]
    numpy.testing.assert_array_almost_equal(l.covariance.matrix(), covars[1].matrix(), self.precs[1])
    l = LandmarkD()
    numpy.testing.assert_array_equal(l.covariance.matrix(), Covar3d().matrix())
    l.covariance = covars[0]
    numpy.testing.assert_array_almost_equal(l.covariance.matrix(), covars[0].matrix(), self.precs[0])