",  }   ref := createRef(t, cm, ch)   cc, err := newCacheContext(ref.Metadata(), nil)  require.NoError(t, err)   dgst, err := cc.Checksum(context.TODO(), ref, "abc/foo", false)  require.NoError(t, err)  require.Equal(t, dgstFileData0, dgst)   dgst, err = cc.Checksum(context.TODO(), ref, "ln", false)  require.NoError(t, err)  require.Equal(t, dgstFileData0, dgst)   dgst, err = cc.Checksum(context.TODO(), ref, "ln0", false)  require.NoError(t, err)  require.Equal(t, dgstFileData0, dgst)   // 