newfs_msdos: connect the ATF test from NetBSD

NetBSD has an ATF test for newfs_msdos.  Connect it to the build.
Adapt it for FreeBSD.  This would have caught the bug fixed by my
previous commit.

Reviewed by:	delphij, emaste
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D34116

contrib/netbsd-tests/sbin/newfs_msdos/t_create.sh

@@ -31,11 +31,21 @@ validfat32_head() {
 }
 validfat32_body() {
 
-	atf_check -s eq:0 -o ignore -e ignore \
+	if true; then
+		# FreeBSD
+		exp_err=empty
+		fsck=fsck_msdosfs
+	else
+		# NetBSD
+		exp_err=ignore
+		fsck=fsck_msdos
+	fi
+
+	atf_check -s eq:0 -o ignore -e $exp_err \
 	    newfs_msdos -b 512 -C 33m -F 32 msdos.img
 #	fsck_msdos/newfs_msdos have been fixed
 #	atf_expect_fail "PR bin/46743"
-	atf_check -s eq:0 -o not-match:FIXED -e empty fsck_msdos -p msdos.img
+	atf_check -s eq:0 -o not-match:FIXED -e empty $fsck -p msdos.img
 	atf_expect_pass
 }
 

etc/mtree/BSD.tests.dist

@@ -442,6 +442,8 @@
         ..
         mdconfig
         ..
+        newfs_msdos
+        ..
         nvmecontrol
         ..
         pfctl

sbin/newfs_msdos/Makefile

@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 PACKAGE=runtime
 PROG=	newfs_msdos
 MAN=	newfs_msdos.8
@@ -11,4 +13,7 @@ WARNS?= 3
 .endif
 CSTD=	c11
 
+HAS_TESTS=
+SUBDIR.${MK_TESTS}+= tests
+
 .include <bsd.prog.mk>

sbin/newfs_msdos/tests/Makefile

@@ -0,0 +1,6 @@
+TESTSRC=${SRCTOP}/contrib/netbsd-tests/sbin/newfs_msdos
+
+NETBSD_ATF_TESTS_SH+=	create
+
+.include <netbsd-tests.test.mk>
+.include <bsd.test.mk>