def METHOD_NAME(self):
    os.chdir(datadir)
    self.par_file = "J1614-2230_NANOGrav_12yv3.wb.gls.par"
    self.tim_file = "J1614-2230_NANOGrav_12yv3.wb.tim"
    self.model = get_model(self.par_file)
    self.toas = get_TOAs(self.tim_file)
    self.default_test_param = []
    for p in self.model.params:
        if not getattr(self.model, p).frozen:
            self.default_test_param.append(p)
    self.test_param_lite = ["F0", "ELONG", "ELAT", "DMX_0023", "JUMP1", "DMJUMP2"]
    self.phase_designmatrix_maker = DesignMatrixMaker("phase", u.Unit(""))
    self.toa_designmatrix_maker = DesignMatrixMaker("toa", u.s)
    self.dm_designmatrix_maker = DesignMatrixMaker("dm", u.pc / u.cm**3)
    self.noise_designmatrix_maker = DesignMatrixMaker("toa_noise", u.s)