[PATCH v2 6/6] t5620: test backfill's unknown argument handling

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <stolee@gmail.com>

Before the recent changes to parse rev-list arguments inside of 'git
backfill', the builtin would take arbitrary arguments without complaint (and
ignore them). This was noticed and a patch was sent [1] which motivates this
change to encode this behavior in test.

[1] https://lore.kernel.org/git/20260321031643.5185-1-r.siddharth.shrimali@gmail.com/

Reported-by: Siddharth Shrimali <r.siddharth.shrimali@gmail.com>
Signed-off-by: Derrick Stolee <stolee@gmail.com>
---
 t/t5620-backfill.sh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/t/t5620-backfill.sh b/t/t5620-backfill.sh
index c6f54ee91c..85740f1f13 100755
--- a/t/t5620-backfill.sh
+++ b/t/t5620-backfill.sh
@@ -7,6 +7,14 @@ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
 . ./test-lib.sh
 
+test_expect_success 'backfill rejects unexpected arguments' '
+	test_must_fail git backfill unexpected-arg 2>err &&
+	test_grep "ambiguous argument .*unexpected-arg" err &&
+
+	test_must_fail git backfill --all --firt-parent unexpected-arg 2>err &&
+	test_grep "ambiguous argument .*unexpected-arg" err
+'
+
 # We create objects in the 'src' repo.
 test_expect_success 'setup repo for object creation' '
 	echo "{print \$1}" >print_1.awk &&
-- 
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