[PATCH] test: add test for git bisect skip with --term* arguments

[Bagas Sanjaya <bagasdotme@gmail.com>]

The current git bisect breakage happens when skipping in the middle of
bisect session which is started with --term-new and --term-old
arguments. This test expect that HEAD changes after skipping, in other
words HEAD before and after skipping must be different.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
NOTE: this patch is not intended for integrating into git.git, but
rather this patch is written to demonstrate this breakage. I hope that
the test can be added to t6030-bisect-porcelain.sh, and make this patch
redundant.  

 t/t6031-bisect-skip.sh | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100755 t/t6031-bisect-skip.sh

diff --git a/t/t6031-bisect-skip.sh b/t/t6031-bisect-skip.sh
new file mode 100755
index 0000000000..0dfc6f0928
--- /dev/null
+++ b/t/t6031-bisect-skip.sh
@@ -0,0 +1,36 @@
+#!/bin/sh
+
+#
+# Copyright (c) 2021 Bagas Sanjaya
+#
+
+test_description='Tests git bisect --skip'
+
+exec </dev/null
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+# hash variables
+HASH_SKIPPED_FROM=
+HASH_SKIPPED_TO=
+
+# initialize testing repo
+init() {
+	for i in `seq 1 20`; do
+		echo $i >> test &&
+		git add test && git commit -m $i
+	done
+}
+
+init
+
+test_expect_success 'test moving HEAD when skip bisecting' '
+	git bisect start --term-new=ok --term-old=whoops HEAD HEAD~9 &&
+	HASH_SKIPPED_FROM=$(git rev-parse --verify HEAD) &&
+	git bisect skip &&
+	HASH_SKIPPED_TO=$(git rev-parse --verify HEAD) &&
+	test $HASH_SKIPPED_FROM != $HASH_SKIPPED_TO
+'
-- 
2.25.1