hastd: Add rudimentary tests

Test that we can start and stop hastd with an empty configuration.

Reviewed by:	kevans
Differential Revision:	https://reviews.freebsd.org/D59345

etc/mtree/BSD.tests.dist

@@ -495,6 +495,8 @@
         ..
         growfs
         ..
+        hastd
+        ..
         ifconfig
         ..
         ipfw

sbin/hastd/Makefile

@@ -35,4 +35,7 @@ YFLAGS+=-v
 
 CLEANFILES=y.tab.c y.tab.h y.output
 
+HAS_TESTS=
+SUBDIR.${MK_TESTS}=	tests
+
 .include <bsd.prog.mk>

sbin/hastd/tests/Makefile

@@ -0,0 +1,4 @@
+PACKAGE=	tests
+ATF_TESTS_SH=	hastd_test
+
+.include <bsd.test.mk>

sbin/hastd/tests/hastd_test.sh

@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2026 Dag-Erling Smørgrav
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+
+atf_test_case ctl cleanup
+ctl_head()
+{
+	atf_set descr "Test that hastd can start, stop, and "\
+		"communicate with hastctl"
+	atf_set require.user "root"
+}
+ctl_body()
+{
+	cat >hast.conf <<EOF
+control $PWD/hastctl
+pidfile $PWD/hastd.pid
+listen $PWD/hastd.sock
+EOF
+	atf_check hastd -c $PWD/hast.conf
+	atf_check -o ignore hastctl status -c $PWD/hast.conf
+	atf_check -o ignore hastctl stop -c $PWD/hast.conf
+	rm -f hastd.pid
+}
+ctl_cleanup()
+{
+	if [ -s hastd.pid ]; then
+		kill -9 "$(cat hastd.pid)" || true
+	fi
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case ctl
+}