i3status: add `package` attribute

modules/programs/i3status.nix

@@ -138,6 +138,8 @@ in {
         }
       '';
     };
+
+    package = mkPackageOption pkgs "i3status" { };
   };
 
   config = mkIf cfg.enable {
@@ -197,7 +199,7 @@ in {
       };
     };
 
-    home.packages = [ pkgs.i3status ];
+    home.packages = [ cfg.package ];
 
     xdg.configFile."i3status/config".text = concatStringsSep "\n" ([ ]
       ++ optional (cfg.general != { }) (formatModule "general" cfg.general)

tests/modules/programs/i3status/with-custom.nix

@@ -16,6 +16,8 @@ with lib;
         interval = 1;
       };
 
+      package = config.lib.test.mkStubPackage { };
+
       modules = {
         "volume master" = {
           position = 1;