dev-libs/qr-code-generator: wire up tests

Signed-off-by: Sam James <sam@gentoo.org>

dev-libs/qr-code-generator/qr-code-generator-1.8.0.ebuild

@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Gentoo Authors
+# Copyright 2023-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -19,6 +19,8 @@ S="${WORKDIR}/QR-Code-generator-${PV}"
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"
+IUSE="test"
+RESTRICT="!test? ( test )"
 
 src_prepare() {
 	# Move the CMake files into the project root.
@@ -26,3 +28,11 @@ src_prepare() {
 
 	cmake_src_prepare
 }
+
+src_configure() {
+	local mycmakeargs=(
+		-DBUILD_TESTS=$(usex test)
+	)
+
+	cmake_src_configure
+}