cyrus_sasl: set up passthru tests

pkgs/development/libraries/cyrus-sasl/default.nix

@@ -1,6 +1,6 @@
 { lib, stdenv, fetchurl, openssl, openldap, libkrb5, db, gettext
 , pam, fixDarwinDylibNames, autoreconfHook, enableLdap ? false
-, buildPackages, pruneLibtoolFiles }:
+, buildPackages, pruneLibtoolFiles, nixosTests }:
 
 with lib;
 stdenv.mkDerivation rec {
@@ -41,6 +41,10 @@ stdenv.mkDerivation rec {
 
   installFlags = lib.optional stdenv.isDarwin [ "framedir=$(out)/Library/Frameworks/SASL2.framework" ];
 
+  passthru.tests = {
+    inherit (nixosTests) parsedmarc postfix;
+  };
+
   meta = {
     homepage = "https://www.cyrusimap.org/sasl";
     description = "Library for adding authentication support to connection-based protocols";