1 files changed, 170 insertions, 0 deletions
diff --git a/t/t2030-unresolve-info.sh b/t/t2030-unresolve-info.sh
new file mode 100755
index 0000000000..f2620650ce
--- /dev/null
+++ b/t/t2030-unresolve-info.sh
@@ -0,0 +1,170 @@
+#!/bin/sh
+
+test_description='undoing resolution'
+
+. ./test-lib.sh
+
+check_resolve_undo () {
+	msg=$1
+	shift
+	while case $# in
+	0)	break ;;
+	1|2|3)	die "Bug in check-resolve-undo test" ;;
+	esac
+	do
+		path=$1
+		shift
+		for stage in 1 2 3
+		do
+			sha1=$1
+			shift
+			case "$sha1" in
+			'') continue ;;
+			esac
+			sha1=$(git rev-parse --verify "$sha1")
+			printf "100644 %s %s\t%s\n" $sha1 $stage $path
+		done
+	done >"$msg.expect" &&
+	git ls-files --resolve-undo >"$msg.actual" &&
+	test_cmp "$msg.expect" "$msg.actual"
+}
+
+prime_resolve_undo () {
+	git reset --hard &&
+	git checkout second^0 &&
+	test_tick &&
+	test_must_fail git merge third^0 &&
+	echo merge does not leave anything &&
+	check_resolve_undo empty &&
+	echo different >fi/le &&
+	git add fi/le &&
+	echo resolving records &&
+	check_resolve_undo recorded fi/le initial:fi/le second:fi/le third:fi/le
+}
+
+test_expect_success setup '
+	mkdir fi &&
+	test_commit initial fi/le first &&
+	git branch side &&
+	git branch another &&
+	test_commit second fi/le second &&
+	git checkout side &&
+	test_commit third fi/le third &&
+	git checkout another &&
+	test_commit fourth fi/le fourth &&
+	git checkout master
+'
+
+test_expect_success 'add records switch clears' '
+	prime_resolve_undo &&
+	test_tick &&
+	git commit -m merged &&
+	echo committing keeps &&
+	check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
+	git checkout second^0 &&
+	echo switching clears &&
+	check_resolve_undo cleared
+'
+
+test_expect_success 'rm records reset clears' '
+	prime_resolve_undo &&
+	test_tick &&
+	git commit -m merged &&
+	echo committing keeps &&
+	check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
+
+	echo merge clears upfront &&
+	test_must_fail git merge fourth^0 &&
+	check_resolve_undo nuked &&
+
+	git rm -f fi/le &&
+	echo resolving records &&
+	check_resolve_undo recorded fi/le initial:fi/le HEAD:fi/le fourth:fi/le &&
+
+	git reset --hard &&
+	echo resetting discards &&
+	check_resolve_undo discarded
+'
+
+test_expect_success 'plumbing clears' '
+	prime_resolve_undo &&
+	test_tick &&
+	git commit -m merged &&
+	echo committing keeps &&
+	check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
+
+	echo plumbing clear &&
+	git update-index --clear-resolve-undo &&
+	check_resolve_undo cleared
+'
+
+test_expect_success 'add records checkout -m undoes' '
+	prime_resolve_undo &&
+	git diff HEAD &&
+	git checkout --conflict=merge fi/le &&
+	echo checkout used the record and removed it &&
+	check_resolve_undo removed &&
+	echo the index and the work tree is unmerged again &&
+	git diff >actual &&
+	grep "^++<<<<<<<" actual
+'
+
+test_expect_success 'unmerge with plumbing' '
+	prime_resolve_undo &&
+	git update-index --unresolve fi/le &&
+	git ls-files -u >actual &&
+	test_line_count = 3 actual
+'
+
+test_expect_success 'rerere and rerere forget' '
+	mkdir .git/rr-cache &&
+	prime_resolve_undo &&
+	echo record the resolution &&
+	git rerere &&
+	rerere_id=$(cd .git/rr-cache && echo */postimage) &&
+	rerere_id=${rerere_id%/postimage} &&
+	test -f .git/rr-cache/$rerere_id/postimage &&
+	git checkout -m fi/le &&
+	echo resurrect the conflict &&
+	grep "^=======" fi/le &&
+	echo reresolve the conflict &&
+	git rerere &&
+	test "z$(cat fi/le)" = zdifferent &&
+	echo register the resolution again &&
+	git add fi/le &&
+	check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
+	test -z "$(git ls-files -u)" &&
+	git rerere forget fi/le &&
+	! test -f .git/rr-cache/$rerere_id/postimage &&
+	tr "\0" "\n" <.git/MERGE_RR >actual &&
+	echo "$rerere_id	fi/le" >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rerere and rerere forget (subdirectory)' '
+	rm -fr .git/rr-cache &&
+	mkdir .git/rr-cache &&
+	prime_resolve_undo &&
+	echo record the resolution &&
+	(cd fi && git rerere) &&
+	rerere_id=$(cd .git/rr-cache && echo */postimage) &&
+	rerere_id=${rerere_id%/postimage} &&
+	test -f .git/rr-cache/$rerere_id/postimage &&
+	(cd fi && git checkout -m le) &&
+	echo resurrect the conflict &&
+	grep "^=======" fi/le &&
+	echo reresolve the conflict &&
+	(cd fi && git rerere) &&
+	test "z$(cat fi/le)" = zdifferent &&
+	echo register the resolution again &&
+	(cd fi && git add le) &&
+	check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
+	test -z "$(git ls-files -u)" &&
+	(cd fi && git rerere forget le) &&
+	! test -f .git/rr-cache/$rerere_id/postimage &&
+	tr "\0" "\n" <.git/MERGE_RR >actual &&
+	echo "$rerere_id	fi/le" >expect &&
+	test_cmp expect actual
+'
+
+test_done