diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..19ed676
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/test-unit-ruby-core-*.gem
+/test-unit-ruby-core-*-additional.tar.gz
diff --git a/rubygem-test-unit-ruby-core.spec b/rubygem-test-unit-ruby-core.spec
new file mode 100644
index 0000000..77e6308
--- /dev/null
+++ b/rubygem-test-unit-ruby-core.spec
@@ -0,0 +1,72 @@
+%global	gem_name test-unit-ruby-core
+
+Name:		rubygem-%{gem_name}
+Version:	1.0.1
+Release:	2%{?dist}
+
+Summary:	Additional test assertions for Ruby standard libraries
+# SPDX confirmed
+License:	BSD-2-Clause
+URL:		https://github.com/ruby/test-unit-ruby-core
+
+Source0:	https://rubygems.org/gems/%{gem_name}-%{version}.gem
+Source1:	%{gem_name}-%{version}-additional.tar.gz
+# Source1 is created by $ bash %%SOURCE2 %%version
+Source2:	test-unit-ruby-core-create-missing-files.sh
+BuildRequires:	ruby(release)
+BuildRequires:	rubygems-devel
+
+BuildArch:		noarch
+
+%description
+Additional test assertions for Ruby standard libraries.
+
+%package	doc
+Summary:	Documentation for %{name}
+Requires:	%{name} = %{version}-%{release}
+BuildArch:	noarch
+
+%description	doc
+Documentation for %{name}.
+
+%prep
+%setup -q -n %{gem_name}-%{version} -b 1
+
+%build
+gem build ../%{gem_name}-%{version}.gemspec
+%gem_install
+
+%install
+mkdir -p %{buildroot}%{gem_dir}
+cp -a .%{gem_dir}/* \
+	%{buildroot}%{gem_dir}/
+
+# Install additional files
+cp -a \
+	LICENSE.txt \
+	README.md \
+	%{buildroot}%{gem_instdir}/
+
+rm -f %{buildroot}%{gem_cache}
+
+%check
+# No available test suite currently
+exit 0
+
+%files
+%dir	%{gem_instdir}
+%doc	%{gem_instdir}/README.md
+%license	%{gem_instdir}/LICENSE.txt
+%{gem_libdir}
+%{gem_spec}
+
+%files doc
+%doc %{gem_docdir}
+
+
+%changelog
+* Fri Jul  7 2023 Mamoru TASAKA <mtasaka@fedoraproject.org> - 1.0.1-2
+- Fix comment for source
+
+* Thu Jun 22 2023 Mamoru TASAKA <mtasaka@fedoraproject.org> - 1.0.1-1
+- Initial package
diff --git a/sources b/sources
new file mode 100644
index 0000000..d38597c
--- /dev/null
+++ b/sources
@@ -0,0 +1,2 @@
+SHA512 (test-unit-ruby-core-1.0.1.gem) = 1e97309e7ad83036d660e958fef8c836a887615fe694208b1f7133e6287c978d530fbeeaaa09052fa7b4113b72bd8a04f55960a13fce2a7ad458b0c518377221
+SHA512 (test-unit-ruby-core-1.0.1-additional.tar.gz) = a678c5cbb91eb6c177b0320bc9d2f7455709394514f6802bfb066345f975d5ad321217951c95965abcb4dd5a8277a9e295e4b335cd304ff2d67a2ed192e704b1
diff --git a/test-unit-ruby-core-create-missing-files.sh b/test-unit-ruby-core-create-missing-files.sh
new file mode 100644
index 0000000..532bfb3
--- /dev/null
+++ b/test-unit-ruby-core-create-missing-files.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+if [ $# -lt 1 ]
+then
+  echo "$0 <version>"
+  exit 1
+fi
+
+set -x
+set -e
+
+VERSION=$1
+
+REPOURL=https://github.com/ruby/
+REPONAME=test-unit-ruby-core
+
+TARBALLNAME=${REPONAME}-${VERSION}-additional.tar.gz
+
+CURRDIR=$(pwd)
+TMPDIRPATH=$(mktemp -d /var/tmp/${REPONAME}-tar-XXXXXX)
+pushd $TMPDIRPATH
+
+git clone ${REPOURL}/${REPONAME}.git
+ln -sf ${REPONAME} ${REPONAME}-${VERSION}
+cd ${REPONAME}
+
+git checkout -b fedora-${VERSION} v${VERSION}
+cd ..
+tar czf $TARBALLNAME \
+	${REPONAME}-${VERSION}/LICENSE.txt \
+	${REPONAME}-${VERSION}/README.md \
+
+mv $TARBALLNAME $CURRDIR
+
+popd
+rm -rf $TMPDIRPATH
+
+