def METHOD_NAME(self):
    # Make sure it properly shrinks the right-hand side if specified.
    covar_est_opt = {
        "shrinker": "frobenius_norm",
        "verbose": 0,
        "max_iter": 250,
        "iter_callback": [],
        "store_iterates": False,
        "rel_tolerance": 1e-12,
        "precision": self.dtype,
    }
    covar_cov2d = self.cov2d.get_covar(
        self.coeff,
        ctf_fb=self.ctf_fb,
        ctf_idx=self.ctf_idx,
        covar_est_opt=covar_est_opt,
    )
    covar_bcov2d = self.bcov2d.get_covar(covar_est_opt=covar_est_opt)
    self.assertTrue(self.blk_diag_allclose(covar_cov2d, covar_bcov2d))