'
+test_expect_success 'switch out of non-branch' '
+ git reset --hard master &&
+ git checkout master^0 &&
+ echo modified >one &&
+ test_must_fail git checkout renamer 2>error.log &&
+ ! grep "^Previous HEAD" error.log
+'
+
+ (
+ echo "#!$SHELL_PATH"
+ cat <<\EOF
+ O=$1 A=$2 B=$3
+ cat "$A" >.tmp
+ exec >"$A"
+ echo '<<<<<<< filfre-theirs'
+ cat "$B"
+ echo '||||||| filfre-common'
+ cat "$O"
+ echo '======='
+ cat ".tmp"
+ echo '>>>>>>> filfre-ours'
+ rm -f .tmp
+ exit 1
+ EOF
+ ) >filfre.sh
+ chmod +x filfre.sh
+
+ test_expect_success 'custom merge driver with checkout -m' '
+ git reset --hard &&
+
+ git config merge.filfre.driver "./filfre.sh %O %A %B" &&
+ git config merge.filfre.name "Feel-free merge driver" &&
+ git config merge.filfre.recursive binary &&
+ echo "arm merge=filfre" >.gitattributes &&
+
+ git checkout -b left &&
+ echo neutral >arm &&
+ git add arm .gitattributes &&
+ test_tick &&
+ git commit -m neutral &&
+ git branch right &&
+
+ echo left >arm &&
+ test_tick &&
+ git commit -a -m left &&
+ git checkout right &&
+
+ echo right >arm &&
+ test_tick &&
+ git commit -a -m right &&
+
+ test_must_fail git merge left &&
+ (
+ for t in filfre-common left right
+ do
+ grep $t arm || exit 1
+ done
+ exit 0
+ ) &&
+
+ mv arm expect &&
+ git checkout -m arm &&
+ test_cmp expect arm
+ '
+
test_done