testing/nix: enable check()

testing/nix/APKBUILD

@@ -40,6 +40,7 @@ makedepends="
 	mdbook
 	nlohmann-json
 	openssl-dev
+	rapidcheck-dev
 	sqlite-dev
 	xz
 	xz-dev
@@ -55,12 +56,6 @@ subpackages="
 	$pkgname-fish-completion
 	$pkgname-zsh-completion
 	"
-# TODO: Tests require rapidcheck which is a poorly maintained C++
-# library without tagged releases, versioned sonames, and more.
-# Hence, we really don't want to package it right now just for nix.
-#
-# See: https://github.com/emil-e/rapidcheck/issues/255
-options="!check"
 source="https://github.com/NixOS/nix/archive/$pkgver/nix-$pkgver.tar.gz
 	0001-absPath-Explicitly-check-if-path-is-empty-before-acc.patch
 	README.alpine
@@ -89,8 +84,7 @@ build() {
 		--localstatedir=/nix/var \
 		--with-sandbox-shell=/bin/busybox.static \
 		--enable-embedded-sandbox-shell \
-		--enable-gc \
-		--disable-unit-tests
+		--enable-gc
 	make
 }