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diff --git a/etc/mtree/BSD.tests.dist b/etc/mtree/BSD.tests.dist
--- a/etc/mtree/BSD.tests.dist
+++ b/etc/mtree/BSD.tests.dist
@@ -794,6 +794,8 @@
..
stripe
..
+ union
+ ..
uzip
etalon
..
diff --git a/tests/sys/geom/class/Makefile b/tests/sys/geom/class/Makefile
--- a/tests/sys/geom/class/Makefile
+++ b/tests/sys/geom/class/Makefile
@@ -18,6 +18,7 @@
TESTS_SUBDIRS+= raid3
TESTS_SUBDIRS+= shsec
TESTS_SUBDIRS+= stripe
+TESTS_SUBDIRS+= union
TESTS_SUBDIRS+= uzip
${PACKAGE}FILES+= geom_subr.sh
diff --git a/tests/sys/geom/class/union/Makefile b/tests/sys/geom/class/union/Makefile
new file mode 100644
--- /dev/null
+++ b/tests/sys/geom/class/union/Makefile
@@ -0,0 +1,8 @@
+
+PACKAGE= tests
+
+TESTSDIR= ${TESTSBASE}/sys/geom/class/${.CURDIR:T}
+
+ATF_TESTS_SH+= union_test
+
+.include <bsd.test.mk>
diff --git a/tests/sys/geom/class/union/union_test.sh b/tests/sys/geom/class/union/union_test.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/geom/class/union/union_test.sh
@@ -0,0 +1,300 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2023 The FreeBSD Foundation
+#
+# This software was developed1 by Yan-Hao Wang <bses30074@gmail.com>
+# under sponsorship from the FreeBSD Foundation.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE
+#
+# $FreeBSD$
+#
+writable_device_name=""
+readable_device_name=""
+gunion_device=""
+
+atf_test_case load
+load_head()
+{
+ atf_set "descr" "Test gunion load and unload"
+}
+load_body()
+{
+ atf_check gunion load
+ atf_check -o ignore sh -c 'kldstat | grep "geom_union.k"'
+ atf_check gunion unload
+ atf_check -s not-exit:0 sh -c 'kldstat | grep "geom_union.k"'
+}
+
+atf_test_case create cleanup
+create_head()
+{
+ atf_set "descr" "Test gunion create and destroy"
+}
+create_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 1m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+
+ atf_check gunion create "$writable_device_name" "$readable_device_name"
+ gunion_device="${writable_device_name}-${readable_device_name}.union"
+ atf_check -o inline:"/dev/${gunion_device}\n" ls "/dev/${gunion_device}"
+
+ atf_check gunion destroy "${gunion_device}"
+ atf_check -e ignore -o ignore -s not-exit:0 ls "/dev/${gunion_device}"
+}
+create_cleanup()
+{
+ cleanup_
+}
+
+atf_test_case commit cleanup
+commit_head()
+{
+ atf_set "descr" "Test basic gunion commit with no argument"
+}
+commit_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 1m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+ mkdir readable_device
+ mkdir writable_device
+ mkdir gunion
+
+ mount "/dev/${readable_device_name}" readable_device
+ echo "I am readable file" > readable_file
+ cp readable_file readable_device/readable_file
+ sync
+ umount readable_device
+
+ gunion create "$writable_device_name" "$readable_device_name"
+ gunion_device="${writable_device_name}-${readable_device_name}.union"
+ mount "/dev/${gunion_device}" gunion
+ checksum gunion/readable_file readable_file
+
+ echo "I am gunion file" > gunion_file
+ cp gunion_file gunion/gunion_file
+ sync
+ umount gunion
+ atf_check gunion commit "${gunion_device}"
+ gunion destroy "${gunion_device}"
+
+ mount "/dev/${writable_device_name}" writable_device
+ mount "/dev/${readable_device_name}" readable_device
+ checksum readable_device/readable_file readable_file
+ checksum writable_device/gunion_file gunion_file
+ checksum readable_device/gunion_file gunion_file
+}
+commit_cleanup()
+{
+ cleanup_
+}
+
+atf_test_case size cleanup
+size_head()
+{
+ atf_set "descr" "Test gunion command with -s size argument"
+}
+size_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 2m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+
+ gunion create -s 2m "$writable_device_name" "$readable_device_name"
+ gunion_device="${writable_device_name}-${readable_device_name}.union"
+ echo "$gunion_device" > gunion_device_1
+
+ size="$(diskinfo "/dev/$gunion_device" | awk '{print $3}')"
+ atf_check_equal "2097152" "$size"
+}
+size_cleanup()
+{
+ cleanup_
+}
+
+atf_test_case secsize cleanup
+secsize_head()
+{
+ atf_set "descr" "Test gunion command with -S secsize argument"
+}
+secsize_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 1m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+
+ gunion create -S 1024 "$writable_device_name" "$readable_device_name"
+ gunion_device="${writable_device_name}-${readable_device_name}.union"
+ echo "$gunion_device" > gunion_device_1
+
+ secsize="$(diskinfo "/dev/$gunion_device" | awk '{print $2}')"
+ atf_check_equal "1024" "$secsize"
+}
+secsize_cleanup()
+{
+ cleanup_
+}
+
+atf_test_case gunionname cleanup
+gunionname_head()
+{
+ atf_set "descr" "Test gunion command with -Z gunionname argument"
+}
+gunionname_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 1m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+
+ gunion create -Z gunion1 "$writable_device_name" "$readable_device_name"
+ echo "gunion1.union" > gunion_device_1
+ atf_check -o inline:"/dev/gunion1.union\n" ls /dev/gunion1.union
+}
+gunionname_cleanup()
+{
+ cleanup_
+}
+
+atf_test_case revert cleanup
+revert_head()
+{
+ atf_set "descr" "Test gunion revert"
+}
+revert_body()
+{
+ gunion load
+ writable_device_name="$(mdconfig -s 1m)"
+ readable_device_name="$(mdconfig -s 1m)"
+ echo "$writable_device_name" > md_device_1
+ echo "$readable_device_name" > md_device_2
+ newfs -U "/dev/${writable_device_name}"
+ newfs -U "/dev/${readable_device_name}"
+ mkdir readable_device
+ mkdir writable_device
+ mkdir gunion
+
+ mount "/dev/${readable_device_name}" readable_device
+ echo "I am readable file" > readable_file
+ cp readable_file readable_device/readable_file
+ sync
+ umount readable_device
+
+ atf_check gunion create "$writable_device_name" "$readable_device_name"
+ gunion_device="${writable_device_name}-${readable_device_name}.union"
+ mount "/dev/${gunion_device}" gunion
+
+ echo "I am gunion file" > gunion_file
+ cp gunion_file gunion/gunion_file
+ sync
+ umount gunion
+ atf_check gunion revert "${gunion_device}"
+ gunion destroy "${gunion_device}"
+
+ mount "/dev/${writable_device_name}" writable_device
+ mount "/dev/${readable_device_name}" readable_device
+ checksum writable_device/gunion_file gunion_file
+ checksum readable_device/readable_file readable_file
+}
+revert_cleanup()
+{
+ cleanup_
+}
+
+atf_init_test_cases()
+{
+ atf_add_test_case load
+ atf_add_test_case create
+ atf_add_test_case commit
+ atf_add_test_case size
+ atf_add_test_case secsize
+ atf_add_test_case gunionname
+ atf_add_test_case revert
+}
+
+cleanup_()
+{
+ if mount | grep -q "/writable_device"; then
+ umount writable_device
+ fi
+ if mount | grep -q "/readable_device"; then
+ umount readable_device
+ fi
+ if mount | grep -q "/gunion"; then
+ umount gunion
+ fi
+
+ if [ -e "gunion_device_1" ]; then
+ gunion destroy "$(cat gunion_device_1)"
+ fi
+ if [ -e "md_device_1" ]; then
+ mdconfig -d -u "$(cat md_device_1)"
+ fi
+ if [ -e "md_device_2" ]; then
+ mdconfig -d -u "$(cat md_device_2)"
+ fi
+
+ gunion unload
+}
+
+checksum()
+{
+ src=$1
+ work=$2
+
+ if [ ! -e "$src" ]; then
+ atf_fail "file not exist"
+ fi
+ if [ ! -e "$work" ]; then
+ atf_fail "file not exist"
+ fi
+
+ src_checksum=$(md5 -q "$src")
+ work_checksum=$(md5 -q "$work")
+
+ if [ "$work_checksum" != "$src_checksum" ]; then
+ atf_fail "md5 checksum didn't match with ${src} and ${work}"
+ fi
+}
\ No newline at end of file

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