def METHOD_NAME(self):
    # Restrict the CFUGridReader functionality to only performing
    # translations and building first level cf-groups for variables.
    self.patch("iris.experimental.ugrid.cf.CFUGridReader._reset")
    self.patch(
        "iris.fileformats.netcdf._thread_safe_nc.DatasetWrapper",
        return_value=self.dataset,
    )
    cf_reader = CFUGridReader("dummy")
    self.cf_group = cf_reader.cf_group