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diff --git a/usr.sbin/mixer/Makefile b/usr.sbin/mixer/Makefile
--- a/usr.sbin/mixer/Makefile
+++ b/usr.sbin/mixer/Makefile
@@ -5,4 +5,7 @@
MAN= ${PROG}.8
LDFLAGS+= -lmixer
+HAS_TESTS=
+SUBDIR.${MK_TESTS}+= tests
+
.include <bsd.prog.mk>
diff --git a/usr.sbin/mixer/tests/Makefile b/usr.sbin/mixer/tests/Makefile
new file mode 100644
--- /dev/null
+++ b/usr.sbin/mixer/tests/Makefile
@@ -0,0 +1,3 @@
+ATF_TESTS_SH+= mixer_test
+
+.include <bsd.test.mk>
diff --git a/usr.sbin/mixer/tests/mixer_test.sh b/usr.sbin/mixer/tests/mixer_test.sh
new file mode 100755
--- /dev/null
+++ b/usr.sbin/mixer/tests/mixer_test.sh
@@ -0,0 +1,285 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 The FreeBSD Foundation
+#
+# This software was developed by Christos Margiolis <christos@FreeBSD.org>
+# 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.
+
+mixer_exists()
+{
+ if ! mixer >/dev/null 2>&1; then
+ atf_skip "no mixer available"
+ fi
+}
+
+save_conf()
+{
+ atf_check -o save:test_mixer_conf mixer -o
+}
+
+restore_conf()
+{
+ mixer_exists
+ test -r "test_mixer_conf" && mixer $(cat test_mixer_conf)
+}
+
+load_dummy()
+{
+ if ! kldload -n snd_dummy; then
+ atf_skip "cannot load snd_dummy.ko"
+ fi
+}
+
+set_default()
+{
+ deflt_unit="$(mixer | grep ^pcm | cut -f1 -d:)"
+ dummy_unit="$(mixer -a | grep "Dummy Audio Device" | cut -f1 -d:)"
+
+ atf_check -o save:test_mixer_deflt_unit echo ${deflt_unit}
+ atf_check -o save:test_mixer_dummy_unit echo ${dummy_unit}
+
+ # Set the dummy as the default
+ mixer -d ${dummy_unit}
+}
+
+restore_default()
+{
+ test -r "test_mixer_deflt_unit" && mixer -d $(cat test_mixer_deflt_unit)
+}
+
+atf_test_case o_flag cleanup
+o_flag_head()
+{
+ atf_set "descr" "Verify that the output of the -o flag can be used " \
+ "as valid input"
+}
+o_flag_body()
+{
+ load_dummy
+ mixer_exists
+ set_default
+
+ atf_check -o ignore -e empty mixer $(mixer -o)
+}
+o_flag_cleanup()
+{
+ restore_default
+}
+
+atf_test_case d_flag cleanup
+d_flag_head()
+{
+ atf_set "descr" "Test default unit setting"
+}
+d_flag_body()
+{
+ load_dummy
+ mixer_exists
+ set_default
+
+ dev="${dummy_unit}"
+ unit=$(echo ${dev} | sed 's/pcm//')
+
+ atf_check -o ignore -e empty mixer -d ${dev}
+ atf_check -o ignore -e empty mixer -d ${unit}
+}
+d_flag_cleanup()
+{
+ restore_default
+}
+
+atf_test_case volume cleanup
+volume_head()
+{
+ atf_set "descr" "Test volume setting"
+}
+volume_body()
+{
+ load_dummy
+ mixer_exists
+ set_default
+ save_conf
+
+ # Test lower bound
+ mixer vol.volume=0
+ atf_check -o match:"0.00:0.00" mixer vol.volume
+
+ mixer vol.volume=-2
+ atf_check -o match:"0.00:0.00" mixer vol.volume
+
+ mixer vol.volume=-1:-2
+ atf_check -o match:"0.00:0.00" mixer vol.volume
+
+ mixer vol.volume=-110%
+ atf_check -o match:"0.00:0.00" mixer vol.volume
+
+ # Test higher bound
+ mixer vol.volume=1
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=+1.01
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=2
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=+1:+1
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=2:2
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=100%
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=110%
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ mixer vol.volume=+110%
+ atf_check -o match:"1.00:1.00" mixer vol.volume
+
+ # Test percentages
+ mixer vol.volume=1
+
+ mixer vol.volume=-10%
+ atf_check -o match:"0.90:0.90" mixer vol.volume
+
+ mixer vol.volume=+5%
+ atf_check -o match:"0.95:0.95" mixer vol.volume
+
+ mixer vol.volume=80%
+ atf_check -o match:"0.80:0.80" mixer vol.volume
+
+ # Test left:right assignment
+ mixer vol.volume=0.80:0.70
+ atf_check -o match:"0.80:0.70" mixer vol.volume
+
+ mixer vol.volume=+5%:+10%
+ atf_check -o match:"0.85:0.80" mixer vol.volume
+
+ mixer vol.volume=-5%:-10%
+ atf_check -o match:"0.80:0.70" mixer vol.volume
+
+ mixer vol.volume=+10%:-15%
+ atf_check -o match:"0.90:0.55" mixer vol.volume
+
+ # Test wrong values
+ atf_check -o ignore -e not-empty mixer vol.volume=foobar
+ atf_check -o ignore -e not-empty mixer vol.volume=2oo:b4r
+ atf_check -o ignore -e not-empty mixer vol.volume=+f0o:1
+}
+volume_cleanup()
+{
+ restore_conf
+ restore_default
+}
+
+atf_test_case mute cleanup
+mute_head()
+{
+ atf_set "descr" "Test muting"
+}
+mute_body()
+{
+ load_dummy
+ mixer_exists
+ set_default
+ save_conf
+
+ # Check that the mute control exists
+ atf_check -o not-empty mixer vol.mute
+
+ atf_check -o ignore -e empty mixer vol.mute=off
+ atf_check -o match:"=off" mixer vol.mute
+
+ atf_check -o ignore -e empty mixer vol.mute=on
+ atf_check -o match:"=on" mixer vol.mute
+
+ atf_check -o ignore -e empty mixer vol.mute=toggle
+ atf_check -o match:"=off" mixer vol.mute
+
+ # Test deprecated interface
+ atf_check -o ignore -e empty mixer vol.mute=0
+ atf_check -o match:"=off" mixer vol.mute
+
+ atf_check -o ignore -e empty mixer vol.mute=1
+ atf_check -o match:"=on" mixer vol.mute
+
+ atf_check -o ignore -e empty mixer vol.mute=^
+ atf_check -o match:"=off" mixer vol.mute
+
+ # Test wrong values
+ atf_check -o ignore -e not-empty mixer vol.mute=foobar
+ atf_check -o ignore -e not-empty mixer vol.mute=10
+}
+mute_cleanup()
+{
+ restore_conf
+ restore_default
+}
+
+atf_test_case recsrc cleanup
+recsrc_head()
+{
+ atf_set "descr" "Test recording source handling"
+}
+recsrc_body()
+{
+ load_dummy
+ mixer_exists
+ set_default
+ save_conf
+ test -n "$(mixer -s)" || atf_skip "no recording source found"
+
+ recsrc=$(mixer -s | awk '{print $2}')
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=add
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=remove
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=set
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=toggle
+
+ # Test deprecated interface
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=+
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=-
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc==
+ atf_check -o ignore -e empty mixer ${recsrc}.recsrc=^
+
+ # Test wrong values
+ atf_check -o ignore -e not-empty mixer ${recsrc}.recsrc=foobar
+ atf_check -o ignore -e not-empty mixer ${recsrc}.recsrc=10
+}
+recsrc_cleanup()
+{
+ restore_conf
+ restore_default
+}
+
+atf_init_test_cases()
+{
+ atf_add_test_case o_flag
+ atf_add_test_case d_flag
+ atf_add_test_case volume
+ atf_add_test_case mute
+ atf_add_test_case recsrc
+}

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