shortlog: warn the user when there is no input

diff --git a/t/t4200-rerere.sh b/t/t4200-rerere.sh
index b68ab11f2915789cd04ac6bd43363aeab2079198..bb402c3780356d1feab4e8b7c9b9624495d3e176 100755 (executable)
--- a/t/t4200-rerere.sh
+++ b/t/t4200-rerere.sh
@@ -57,7 +57,7 @@ test_expect_success 'conflicting merge' '
        test_must_fail git merge first
 '
 
-sha1=$(sed -e 's/      .*//' .git/MERGE_RR)
+sha1=$(perl -pe 's/    .*//' .git/MERGE_RR)
 rr=.git/rr-cache/$sha1
 test_expect_success 'recorded preimage' "grep ^=======$ $rr/preimage"
 
@@ -190,8 +190,6 @@ test_expect_success 'file2 added differently in two branches' '
        git add file2 &&
        git commit -m version2 &&
        test_must_fail git merge fourth &&
-       sha1=$(sed -e "s/       .*//" .git/MERGE_RR) &&
-       rr=.git/rr-cache/$sha1 &&
        echo Cello > file2 &&
        git add file2 &&
        git commit -m resolution
@@ -219,7 +217,22 @@ test_expect_success 'rerere.autoupdate' '
        git checkout version2 &&
        test_must_fail git merge fifth &&
        test 0 = $(git ls-files -u | wc -l)
+'
 
+test_expect_success 'merge --rerere-autoupdate' '
+       git config --unset rerere.autoupdate
+       git reset --hard &&
+       git checkout version2 &&
+       test_must_fail git merge --rerere-autoupdate fifth &&
+       test 0 = $(git ls-files -u | wc -l)
+'
+
+test_expect_success 'merge --no-rerere-autoupdate' '
+       git config rerere.autoupdate true
+       git reset --hard &&
+       git checkout version2 &&
+       test_must_fail git merge --no-rerere-autoupdate fifth &&
+       test 2 = $(git ls-files -u | wc -l)
 '
 
 test_done