dev-util/mock: override src_test function

Closes: https://bugs.gentoo.org/920445
Signed-off-by: Takuya Wakazono <pastalian46@gmail.com>

dev-util/mock/mock-5.3.ebuild

@@ -17,9 +17,10 @@ SRC_URI="https://github.com/rpm-software-management/mock/releases/download/${P}-
 LICENSE="GPL-2+"
 SLOT="0"
 KEYWORDS="~amd64"
+IUSE="test"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+RESTRICT="!test? ( test )"
 
-#DEPEND=""
 RDEPEND="
 	${PYTHON_DEPS}
 	$(python_gen_cond_dep '
@@ -36,6 +37,10 @@ RDEPEND="
 	dev-util/distribution-gpg-keys
 	dev-util/mock-core-configs
 "
+BDEPEND="
+	${PYTHON_DEPS}
+	test? ( $(python_gen_cond_dep 'dev-python/pytest[${PYTHON_USEDEP}]') )
+"
 
 src_prepare() {
 	default
@@ -77,6 +82,10 @@ src_install() {
 	keepdir /var/lib/mock
 }
 
+src_test() {
+	epytest tests
+}
+
 pkg_postinst() {
 	optfeature "chain mode support" app-arch/createrepo_c
 	optfeature "pigz in root_cache plugin" app-arch/pigz