sponge(1): fix my tests

Reviewed by:	kevans

etc/mtree/BSD.tests.dist

@@ -712,6 +712,8 @@
         ..
         soelim
         ..
+        sponge
+        ..
         stat
         ..
         tail

usr.bin/Makefile

@@ -148,6 +148,7 @@ SUBDIR=	alias \
 	soelim \
 	sort \
 	split \
+	sponge \
 	stat \
 	stdbuf \
 	strings \

usr.bin/sponge/tests/Makefile

@@ -1,9 +1,9 @@
 # $FreeBSD$
 
-PACKAGE=	${TESTBASE}/usr.bin/sponge
+PACKAGE=	tests
 
-TESTSDIR=	${TESTSBASE}/usr.bin/sponge/tests
+TESTSDIR=	${TESTSBASE}/usr.bin/sponge
 
-ATF_TESTS_SH=	cp_test
+ATF_TESTS_SH=	sponge_test
 
 .include <bsd.test.mk>

usr.bin/sponge/tests/sponge_test.sh

@@ -33,7 +33,7 @@ simple_body() {
   printf 'a\nd\ne\n' >| y
   sort x | sponge x
 
-  atf_check -s exit:0 -o empty -e empty 'sort x | sponge x'
+  atf_check -s exit:0 -o empty -e empty -x 'sort x | sponge x'
 
   if ! cmp -s x y; then
     echo "x and y differ, but they should be equal"