nixd: add version and pkg-config testers

pkgs/development/tools/language-servers/nixd/default.nix

@@ -15,6 +15,7 @@
 , nix
 , nixpkgs-fmt
 , pkg-config
+, testers
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -80,6 +81,16 @@ stdenv.mkDerivation (finalAttrs: {
 
   passthru.updateScript = nix-update-script { };
 
+  passthru.tests = {
+    version = testers.testVersion {
+      package = finalAttrs.finalPackage;
+    };
+    pkg-config = testers.hasPkgConfigModules {
+      package = finalAttrs.finalPackage;
+      moduleNames = [ "libnixf" "libnixt" ];
+    };
+  };
+
   meta = {
     description = "Nix language server";
     homepage = "https://github.com/nix-community/nixd";