sysctl: tests: fix a couple issues

The function that sets test case metadata is actually named ${tc}_head
rather than ${tc}, so add the suffix.

While we're here, hook the tests up to the infrastructure so that they
do get run.

Sponsored by:	Klara, Inc.

etc/mtree/BSD.tests.dist

@@ -466,6 +466,8 @@
         ..
         route
         ..
+        sysctl
+        ..
     ..
     secure
         lib

sbin/sysctl/Makefile

@@ -1,10 +1,15 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 PACKAGE=runtime
 CONFS=	sysctl.conf
 PROG=	sysctl
 WARNS?=	3
 MAN=	sysctl.8
 
+HAS_TESTS=
+SUBDIR.${MK_TESTS}+=	tests
+
 .include <bsd.prog.mk>

sbin/sysctl/tests/sysctl_test.sh

@@ -38,7 +38,7 @@ sysctl_by_name_body()
 
 
 atf_test_case sysctl_nflag
-sysctl_nflag()
+sysctl_nflag_head()
 {
 	atf_set "descr" "Verify -n argument"
 }
@@ -49,7 +49,7 @@ sysctl_nflag_body()
 
 
 atf_test_case sysctl_eflag
-sysctl_eflag()
+sysctl_eflag_head()
 {
 	atf_set "descr" "Verify -e argument"
 }
@@ -60,7 +60,7 @@ sysctl_eflag_body()
 
 
 atf_test_case sysctl_tflag
-sysctl_tflag()
+sysctl_tflag_head()
 {
 	atf_set "descr" "Verify -t argument"
 }
@@ -71,7 +71,7 @@ sysctl_tflag_body()
 
 
 atf_test_case sysctl_dflag
-sysctl_dflag()
+sysctl_dflag_head()
 {
 	atf_set "descr" "Verify -d argument"
 }
@@ -82,7 +82,7 @@ sysctl_dflag_body()
 
 
 atf_test_case sysctl_tflag_dflag
-sysctl_tflag_dflag()
+sysctl_tflag_dflag_head()
 {
 	atf_set "descr" "Verify -t -d arguments"
 }
@@ -94,7 +94,7 @@ sysctl_tflag_dflag_body()
 
 
 atf_test_case sysctl_nflag_tflag_dflag
-sysctl_nflag_tflag_dflag()
+sysctl_nflag_tflag_dflag_head()
 {
 	atf_set "descr" "Verify -n -t -d arguments"
 }