diff --git a/math/py-permutation/Makefile b/math/py-permutation/Makefile
index 806988b50e65..26407ec4668f 100644
--- a/math/py-permutation/Makefile
+++ b/math/py-permutation/Makefile
@@ -1,24 +1,35 @@
 PORTNAME=	permutation
-DISTVERSION=	0.3.0
+DISTVERSION=	0.3.1
 CATEGORIES=	math python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Permutations of finitely many positive integers
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}coverage>0:devel/py-coverage@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}pytest>0:devel/py-pytest@${PY_FLAVOR}
+
 USES=		python:3.6+
 USE_PYTHON=	distutils autoplist
 
 NO_ARCH=	yes
 
 pre-configure: # permutation is officially built with "build" (https://github.com/pypa/build), but this is easily circumvented with this simple setup.py
 	@( \
 		${ECHO} "from setuptools import setup" && \
 		${ECHO} "setup()" \
 	) > ${WRKSRC}/setup.py
 
+do-test: install # instructions from tox.ini
+	@cd ${WRKSRC} && \
+		coverage erase && \
+		coverage run -m pytest --doctest-modules --pyargs permutation && \
+		coverage run -m pytest test README.rst docs/index.rst && \
+		coverage combine && \
+		coverage report
+
 .include <bsd.port.mk>
diff --git a/math/py-permutation/distinfo b/math/py-permutation/distinfo
index dcd041a24fd8..b2504a4808b1 100644
--- a/math/py-permutation/distinfo
+++ b/math/py-permutation/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1608707865
-SHA256 (permutation-0.3.0.tar.gz) = 61cff29def92d72cd828d6866a6a01d03e4a4191d798a73e9ce08c0907b01ba9
-SIZE (permutation-0.3.0.tar.gz) = 16951
+TIMESTAMP = 1633535476
+SHA256 (permutation-0.3.1.tar.gz) = fb0f87097546d4ad222169601a5c2663485ed8cac2b244e7c81c27604c1a62b7
+SIZE (permutation-0.3.1.tar.gz) = 16930