diff --git a/math/combblas/Makefile b/math/combblas/Makefile
index 9f55939ecad2..cc51a7ab3488 100644
--- a/math/combblas/Makefile
+++ b/math/combblas/Makefile
@@ -1,31 +1,38 @@
 PORTNAME=	CombBLAS
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.0.0
+MASTER_SITES=	https://portal.nersc.gov/project/m1982/CombBLAS/:test_data
 CATEGORIES=	math
+DISTFILES=	testdata_combblas1.6.1.tgz:test_data
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Combinatorial BLAS library: an extensible parallel graph library
 
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 ONLY_FOR_ARCHS=	amd64 powerpc64 powerpc64le
 ONLY_FOR_ARCHS_REASON=	fails to build: uses x86 asm
 
 LIB_DEPENDS=	libmpi.so:net/mpich
 RUN_DEPENDS=	${LOCALBASE}/lib/gcc${GCC_DEFAULT}/libgcc_s.so.1:lang/gcc${GCC_DEFAULT} # because of the link flags induced by mpich
 
 USES=		cmake:testing compiler:c++14-lang localbase:ldflags tar:tgz
 USE_LDCONFIG=	yes
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	PASSIONLab
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 
 # many tests fail, see https://github.com/PASSIONLab/CombBLAS/issues/15
 
 post-extract:
 	@cd ${WRKSRC}/include && ${RM} .DS_Store ._.DS_Store CombBLAS/._CombBLAS.h
 
+pre-test:
+	@if [ ! -L ${TEST_WRKSRC}TESTDATA ]; then \
+		${RLN} ${WRKDIR}/TESTDATA ${TEST_WRKSRC}/; \
+	fi
+
 .include <bsd.port.mk>
diff --git a/math/combblas/distinfo b/math/combblas/distinfo
index b4f210f5ee3f..7a7c882a9fd0 100644
--- a/math/combblas/distinfo
+++ b/math/combblas/distinfo
@@ -1,3 +1,5 @@
-TIMESTAMP = 1657902673
+TIMESTAMP = 1657912531
+SHA256 (testdata_combblas1.6.1.tgz) = 07d5683d8435bf1ae6febbf0021203fd23570bbab9c56affe1dc0dcf023ac207
+SIZE (testdata_combblas1.6.1.tgz) = 33734592
 SHA256 (PASSIONLab-CombBLAS-v2.0.0_GH0.tar.gz) = 632a94201a042a2a9aa86803f50ee38b7bf0aa1cfef6ba0eb34ea4007f79a679
 SIZE (PASSIONLab-CombBLAS-v2.0.0_GH0.tar.gz) = 43776896