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t/t5333-pseudo-merge-bitmaps.sh: demonstrate empty pseudo-merge groups

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Demonstrate that it is possible to generate empty pseudo-merge commits
in certain cases.

In the below instance, we generate one non-empty pseudo-merge
(containing commit "base"), and one empty pseudo-merge group
(corresponding to the unstable commits within that group).

(In my testing, the pseudo-merge machinery seems to handle empty groups
just fine, but generating them is pointless as they carry no
information.)

This commit (introducing a deliberate "test_expect_failure") is split
out from the actual fix (which will appear in the following commit) to
demonstrate that the failure is correctly induced.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2024-08-15 13:31:14 -04:00 committed by Junio C Hamano
parent 187504f9b2
commit 42f80e361c
1 changed files with 20 additions and 0 deletions
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t/t5333-pseudo-merge-bitmaps.sh
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@ -390,4 +390,24 @@ test_expect_success 'pseudo-merge reuse' '
)
'
test_expect_failure 'empty pseudo-merge group' '
git init pseudo-merge-empty-group &&
(
cd pseudo-merge-empty-group &&
# Ensure that a pseudo-merge group with no unstable
# commits does not generate an empty pseudo-merge
# bitmap.
git config bitmapPseudoMerge.empty.pattern refs/ &&
test_commit base &&
git repack -adb &&
test-tool bitmap dump-pseudo-merges >merges &&
test_line_count = 1 merges &&
test 0 -eq "$(grep -c commits=0 <merges)"
)
'
test_done