Install this version:
emerge -a =dev-perl/Test-Assert-0.50.400-r2
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-perl/Test-Assert-0.50.400-r2
Or alternatively:
emerge --autounmask-write -a =dev-perl/Test-Assert-0.50.400-r2
# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DIST_AUTHOR=DEXTER
DIST_VERSION=0.0504
inherit perl-module
DESCRIPTION="Assertion methods for those who like JUnit"
SLOT="0"
KEYWORDS="~amd64 ~x86"
RDEPEND="
>=dev-perl/constant-boolean-0.20.0
>=dev-perl/Exception-Base-0.210.0
>=dev-perl/Symbol-Util-0.20.200
"
BDEPEND="${RDEPEND}
dev-perl/Module-Build
dev-perl/Class-Inspector
virtual/perl-parent
>=dev-perl/Test-Unit-Lite-0.110.0
"
>=dev-perl/constant-boolean-0.20.0 >=dev-perl/Exception-Base-0.210.0 >=dev-perl/Symbol-Util-0.20.200
>=dev-perl/constant-boolean-0.20.0 >=dev-perl/Exception-Base-0.210.0 >=dev-perl/Symbol-Util-0.20.200 dev-perl/Module-Build dev-perl/Class-Inspector virtual/perl-parent >=dev-perl/Test-Unit-Lite-0.110.0