1 files changed, 200 insertions, 0 deletions
diff --git a/t/t4056-diff-order.sh b/t/t4056-diff-order.sh
new file mode 100755
index 0000000..aec1d9d
--- /dev/null
+++ b/t/t4056-diff-order.sh
@@ -0,0 +1,200 @@
+#!/bin/sh
+
+test_description='diff order & rotate'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+create_files () {
+	echo "$1" >a.h &&
+	echo "$1" >b.c &&
+	echo "$1" >c/Makefile &&
+	echo "$1" >d.txt &&
+	git add a.h b.c c/Makefile d.txt &&
+	git commit -m"$1"
+}
+
+test_expect_success 'setup' '
+	mkdir c &&
+	create_files 1 &&
+	create_files 2 &&
+
+	cat >order_file_1 <<-\EOF &&
+	*Makefile
+	*.txt
+	*.h
+	EOF
+
+	cat >order_file_2 <<-\EOF &&
+	*Makefile
+	*.h
+	*.c
+	EOF
+
+	cat >expect_none <<-\EOF &&
+	a.h
+	b.c
+	c/Makefile
+	d.txt
+	EOF
+
+	cat >expect_1 <<-\EOF &&
+	c/Makefile
+	d.txt
+	a.h
+	b.c
+	EOF
+
+	cat >expect_2 <<-\EOF
+	c/Makefile
+	a.h
+	b.c
+	d.txt
+	EOF
+'
+
+test_expect_success "no order (=tree object order)" '
+	git diff --name-only HEAD^..HEAD >actual &&
+	test_cmp expect_none actual
+'
+
+test_expect_success 'missing orderfile' '
+	rm -f bogus_file &&
+	test_must_fail git diff -Obogus_file --name-only HEAD^..HEAD
+'
+
+test_expect_success POSIXPERM,SANITY 'unreadable orderfile' '
+	>unreadable_file &&
+	chmod -r unreadable_file &&
+	test_must_fail git diff -Ounreadable_file --name-only HEAD^..HEAD
+'
+
+test_expect_success "orderfile using option from subdir with --output" '
+	mkdir subdir &&
+	git -C subdir diff -O../order_file_1 --output ../actual --name-only HEAD^..HEAD &&
+	test_cmp expect_1 actual
+'
+
+for i in 1 2
+do
+	test_expect_success "orderfile using option ($i)" '
+		git diff -Oorder_file_$i --name-only HEAD^..HEAD >actual &&
+		test_cmp expect_$i actual
+	'
+
+	test_expect_success PIPE "orderfile is fifo ($i)" '
+		rm -f order_fifo &&
+		mkfifo order_fifo &&
+		{
+			cat order_file_$i >order_fifo &
+		} &&
+		git diff -O order_fifo --name-only HEAD^..HEAD >actual &&
+		wait &&
+		test_cmp expect_$i actual
+	'
+
+	test_expect_success "orderfile using config ($i)" '
+		git -c diff.orderfile=order_file_$i diff --name-only HEAD^..HEAD >actual &&
+		test_cmp expect_$i actual
+	'
+
+	test_expect_success "cancelling configured orderfile ($i)" '
+		git -c diff.orderfile=order_file_$i diff -O/dev/null --name-only HEAD^..HEAD >actual &&
+		test_cmp expect_none actual
+	'
+done
+
+test_expect_success 'setup for testing combine-diff order' '
+	git checkout -b tmp HEAD~ &&
+	create_files 3 &&
+	git checkout main &&
+	git merge --no-commit -s ours tmp &&
+	create_files 5
+'
+
+test_expect_success "combine-diff: no order (=tree object order)" '
+	git diff --name-only HEAD HEAD^ HEAD^2 >actual &&
+	test_cmp expect_none actual
+'
+
+for i in 1 2
+do
+	test_expect_success "combine-diff: orderfile using option ($i)" '
+		git diff -Oorder_file_$i --name-only HEAD HEAD^ HEAD^2 >actual &&
+		test_cmp expect_$i actual
+	'
+done
+
+### rotate and skip
+
+test_expect_success 'rotate and skip setup' '
+	>sample1.t &&
+	>sample2.t &&
+	>sample3.t &&
+	>sample4.t &&
+	git add sample[1234].t &&
+	git commit -m "added" sample[1234].t &&
+	echo modified >>sample1.t &&
+	echo modified >>sample2.t &&
+	echo modified >>sample4.t &&
+	git commit -m "updated" sample[1234].t
+'
+
+test_expect_success 'diff --rotate-to' '
+	git diff --rotate-to=sample2.t --name-only HEAD^ >actual &&
+	test_write_lines sample2.t sample4.t sample1.t >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'diff --skip-to' '
+	git diff --skip-to=sample2.t --name-only HEAD^ >actual &&
+	test_write_lines sample2.t sample4.t >expect &&
+	test_cmp expect actual
+'
+
+test_expect_success 'diff --rotate/skip-to error condition' '
+	test_must_fail git diff --rotate-to=sample3.t HEAD^ &&
+	test_must_fail git diff --skip-to=sample3.t HEAD^
+'
+
+test_expect_success 'log --rotate-to' '
+	git log --rotate-to=sample3.t --raw HEAD~2.. >raw &&
+	# just distill the commit header and paths
+	sed -n -e "s/^commit.*/commit/p" \
+	       -e "/^:/s/^.*	//p" raw >actual &&
+
+	cat >expect <<-\EOF &&
+	commit
+	sample4.t
+	sample1.t
+	sample2.t
+	commit
+	sample3.t
+	sample4.t
+	sample1.t
+	sample2.t
+	EOF
+
+	test_cmp expect actual
+'
+
+test_expect_success 'log --skip-to' '
+	git log --skip-to=sample3.t --raw HEAD~2.. >raw &&
+	# just distill the commit header and paths
+	sed -n -e "s/^commit.*/commit/p" \
+	       -e "/^:/s/^.*	//p" raw >actual &&
+
+	cat >expect <<-\EOF &&
+	commit
+	sample4.t
+	commit
+	sample3.t
+	sample4.t
+	EOF
+
+	test_cmp expect actual
+'
+
+test_done