trealla: add version tester

pkgs/by-name/tr/trealla/package.nix

@@ -5,6 +5,7 @@
   openssl,
   readline,
   stdenv,
+  testers,
   valgrind,
   xxd,
   # Boolean flags
@@ -68,6 +69,15 @@ stdenv.mkDerivation (finalAttrs: {
 
   checkFlags = [ "test" ] ++ lib.optionals checkLeaks [ "leaks" ];
 
+  passthru = {
+    tests = {
+      version = testers.testVersion {
+        package = finalAttrs.finalPackage;
+        version = "v${finalAttrs.version}";
+      };
+    };
+  };
+
   meta = {
     homepage = "https://trealla-prolog.github.io/trealla/";
     description = "A compact, efficient Prolog interpreter written in ANSI C";