dev-R/brio: add tests

Signed-off-by: Robert Greener <me@r0bert.dev>

dev-R/brio/brio-1.1.3.ebuild

@@ -8,8 +8,20 @@ inherit R-packages
 DESCRIPTION='Basic R Input Output'
 KEYWORDS="~amd64"
 LICENSE='MIT'
+RESTRICT="!test? ( test )"
+IUSE="test"
+DEPEND="
+	test? ( >=dev-R/testthat-2.1.0 )
+"
 
 SUGGESTED_PACKAGES="
 	dev-R/covr
 	>=dev-R/testthat-2.1.0
 "
+
+src_test() {
+	if use test; then
+		cd "${WORKDIR}/${P}/tests"
+		NOT_CRAN=true R_LIBS="${T}/R" edo Rscript --vanilla testthat.R
+	fi
+}

dev-R/brio/metadata.xml

@@ -17,4 +17,7 @@ files and provide more explicit control over line endings.</longdescription>
 		<bugs-to>https://github.com/r-lib/brio/issues</bugs-to>
 		<remote-id type="github">r-lib/brio</remote-id>
 	</upstream>
+	<use>
+		<flag name="test">Run the tests</flag>
+	</use>
 </pkgmetadata>