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t4205: compare huge output without diff 

The huge-commit test compares output containing a line larger than 2 GiB.
For two identical files containing 2,147,483,649 "1" bytes followed by
"0\n", GNU diffutils 3.8 on Linux arm64 gives these measurements:

  Command               Mean +/- stddev       Maximum RSS (KiB)
  diff -u expect actual  5.276 +/- 0.572 s              4199924
  cmp expect actual      0.506 +/- 0.099 s                 1264

The test needs only an equality check. Use test_cmp_bin, which runs cmp,
to compare the output byte for byte with less time and memory.

Assisted-by: LLM
Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Tamir Duberstein 2026-09-25 12:35:38 -04:00 committed by Junio C Hamano
parent e9019fcafe
commit 73072c5dcb
1 changed files with 1 additions and 1 deletions
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t/t4205-log-pretty-formats.sh
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@ -1189,7 +1189,7 @@ test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'set up huge commit' '
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
git log -1 --format="%B%<(1)%x30" $huge_commit >actual &&
echo 0 >>expect &&
test_cmp expect actual
test_cmp_bin expect actual
'

test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message does not cause allocation failure' '