[PATCH v2] t7001: add failure test which triggers assertion

[kristofferhaugsbakk@fastmail.com]

From: Kristoffer Haugsbakk <code@khaugsbakk.name>

git-mv(1) gets very confused:

    git: builtin/mv.c:506: cmd_mv: Assertion `pos >= 0' failed.
    Aborted (core dumped)
    test_must_fail: died by signal 6: git mv a/a.txt a b
    fatal: Unable to create '<path>.git/index.lock': File exists.

    Another git process seems to be running in this repository, e.g.
    an editor opened by 'git commit'. Please make sure all processes
    are terminated then try again. If it still fails, a git process
    may have crashed in this repository earlier:
    remove the file manually to continue.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
---

Notes (series):
    It’s been a good while.  Let’s just add this as a known breakage?

 t/t7001-mv.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
index 86258f9f430..739c25e2551 100755
--- a/t/t7001-mv.sh
+++ b/t/t7001-mv.sh
@@ -551,4 +551,16 @@ test_expect_success 'moving nested submodules' '
 	git status
 '
 
+test_expect_failure 'nonsense mv triggers assertion failure at builtin/mv.c:502' '
+	test_when_finished git reset --hard HEAD &&
+	git reset --hard HEAD &&
+	mkdir -p a &&
+	mkdir -p b &&
+	>a/a.txt &&
+	git add a/a.txt &&
+	test_must_fail git mv a/a.txt a b &&
+	git status --porcelain >actual &&
+	grep "^A[ ]*a/a.txt$" actual
+'
+
 test_done

base-commit: 34b6ce9b30747131b6e781ff718a45328aa887d0
-- 
2.46.1.641.g54e7913fcb6