app-metrics/bind_exporter: fix tests

Closes: https://bugs.gentoo.org/893094
Signed-off-by: William Hubbs <williamh@gentoo.org>

app-metrics/bind_exporter/bind_exporter-0.3.0.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -30,6 +30,10 @@ src_compile() {
 	promu build -v --prefix bin || die
 }
 
+src_test() {
+	emake test-flags= test
+}
+
 src_install() {
 	dobin bin/${PN}
 	dodoc {README,CHANGELOG}.md