photofield: add passthru.tests.version

pkgs/servers/photofield/default.nix

@@ -5,6 +5,8 @@
 , makeWrapper
 , exiftool
 , ffmpeg
+, testers
+, photofield
 }:
 
 let
@@ -61,6 +63,11 @@ buildGoModule rec {
       --prefix PATH : "${lib.makeBinPath [exiftool ffmpeg]}"
   '';
 
+  passthru.tests.version = testers.testVersion {
+    package = photofield;
+    command = "photofield -version";
+  };
+
   meta = with lib; {
     description = "Experimental fast photo viewer";
     homepage = "https://github.com/SmilyOrg/photofield";