t5516: test pushing a tag of an otherwise unreferenced blob
It's not unreasonable to have a tag that points to a blob that is not part of the normal history. We do this in git.git to distribute gpg keys. However, we never explicitly checked in our test suite that this actually works (i.e., that pack-objects actually sends the blob because of the tag mentioning it). It does in fact work fine, but a recent patch under discussion broke this, and the test suite didn't notice. Let's make the test suite more complete. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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