memtest86plus: add nixosTests.systemd-boot.memtest86 to tests

pkgs/by-name/me/memtest86plus/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  nixosTests,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -30,6 +31,8 @@ stdenv.mkDerivation (finalAttrs: {
     install -Dm0444 mt86plus $out/mt86plus.efi
   '';
 
+  passthru.tests.systemd-boot-memtest = nixosTests.systemd-boot.memtest86;
+
   meta = {
     homepage = "https://www.memtest.org/";
     description = "Tool to detect memory errors";