func manifestMustEqual(expected, actual manifest.Manifest, t *testing.T) {
actualSha, err := actual.SHA()
Assert(t).IsNil(err, "should have gotten SHA from old manifest")
expectedSha, err := expected.SHA()
Assert(t).IsNil(err, "should have gotten SHA from known old manifest")
manifestBytes, err := expected.Marshal()
Assert(t).IsNil(err, "should have gotten bytes from manifest")
actualBytes, err := actual.Marshal()
Assert(t).IsNil(err, "should have gotten bytes from writtenOld")
Assert(t).AreEqual(expectedSha, actualSha, fmt.Sprintf("known: \n\n%s\n\nactual:\n\n%s\n", string(manifestBytes), string(actualBytes)))
}