graphqurl: add updateScript and testVersion

pkgs/by-name/gr/graphqurl/package.nix

@@ -2,6 +2,9 @@
   lib,
   buildNpmPackage,
   fetchFromGitHub,
+  nix-update-script,
+  testers,
+  graphqurl,
 }:
 
 buildNpmPackage rec {
@@ -19,6 +22,15 @@ buildNpmPackage rec {
 
   dontNpmBuild = true;
 
+  passthru = {
+    updateScript = nix-update-script { };
+    tests = {
+      graphqurl-version = testers.testVersion {
+        package = graphqurl;
+      };
+    };
+  };
+
   meta = {
     description = "CLI and JS library for making GraphQL queries";
     homepage = "https://github.com/hasura/graphqurl";