security/py-vici: fix tests

Switch to USES=pytest, fix test depends and run pytest directly
instead of through tox, which hinders testing by trying to use
unrelated interpreters and install dependencies with pip.

Reported by:	reprise
Approved by:	portmgr blanket

security/py-vici/Makefile

@@ -10,16 +10,12 @@ COMMENT=	Native Python interface for strongSwan's VICI protocol
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pycodestyle>0:devel/py-pycodestyle@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}pytest>0:devel/py-pytest@${PY_FLAVOR} \
-		${PYTHON_PKGNAMEPREFIX}tox>0:devel/py-tox@${PY_FLAVOR}
+TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pytest-pycodestyle>0:devel/py-pytest-pycodestyle@${PY_FLAVOR}
 
-USES=		python:3.6+
+USES=		python:3.6+ pytest
 USE_PYTHON=	autoplist concurrent distutils
+PYTEST_ARGS=	--pycodestyle
 
 NO_ARCH=	yes
 
-do-test: # skip non installed python versions in the tests (because flavors)
-	cd ${WRKSRC} && ${SETENV} ${TEST_ENV} ${PYTHON_CMD} -m tox --skip-missing-interpreters
-
 .include <bsd.port.mk>