tests: expect no output while compiling noopchroot

This way we hopefully notice (new) warnings in this little helper.

Git-Dch: Ignore

test/integration/framework

@@ -517,7 +517,7 @@ int execvp(const char *file, char *const argv[]) {
 	return func_execvp(newfile, argv);
 }
 EOF
-	testsuccess --nomsg gcc -Wall -fPIC -shared -o noopchroot.so noopchroot.c -ldl
+	testempty --nomsg gcc -Wall -Wextra -fPIC -shared -o noopchroot.so noopchroot.c -ldl
 }
 configcompression() {
 	local CMD='apthelper cat-file -C'
@@ -1313,9 +1313,13 @@ testfileequal() {
 
 testempty() {
 	msggroup 'testempty'
-	msgtest "Test for no output of" "$*"
+	if [ "$1" = '--nomsg' ]; then
+		shift
+	else
+		msgtest "Test for no output of" "$*"
+	fi
 	local COMPAREFILE="${TMPWORKINGDIRECTORY}/rootdir/tmp/testempty.comparefile"
-	if ("$@" >"$COMPAREFILE" 2>&1 || true) && test ! -s "$COMPAREFILE"; then
+	if "$@" >"$COMPAREFILE" 2>&1 && test ! -s "$COMPAREFILE"; then
 		msgpass
 	else
 		msgfailoutput '' "$COMPAREFILE" "$@"

test/integration/test-external-dependency-solver-protocol

@@ -124,7 +124,7 @@ rm -f "$APT_EDSP_DUMP_FILENAME"
 testfailure aptget install --solver dump awesomecoolstuff:i386 -s
 testsuccess test -s "$APT_EDSP_DUMP_FILENAME"
 testequal 'Install: awesomecoolstuff:i386' grep :i386 "$APT_EDSP_DUMP_FILENAME"
-testempty grep -e ':amd64' -e 'Architecture: any' "$APT_EDSP_DUMP_FILENAME"
+testfailure grep -e ':amd64' -e 'Architecture: any' "$APT_EDSP_DUMP_FILENAME"
 
 testsuccess aptget dist-upgrade -s
 testsuccess aptget dist-upgrade -s --solver apt