hound: add passthru.tests

pkgs/development/tools/misc/hound/default.nix

@@ -4,6 +4,7 @@
 , makeWrapper
 , mercurial
 , git
+, nixosTests
 }:
 
 buildGoModule rec {
@@ -28,6 +29,8 @@ buildGoModule rec {
     wrapProgram $out/bin/houndd --prefix PATH : ${lib.makeBinPath [ mercurial git ]}
   '';
 
+  passthru.tests = { inherit (nixosTests) hound; };
+
   meta = with lib; {
     inherit (src.meta) homepage;
     description = "Lightning fast code searching made easy";